Outlook 365 Teams

Microsoft Teams are a part of Office 365 Groups. When Microsoft Teams was launched into Public Preview in November 2016 there was a lot of confusion as this Slack competitor seemed to come out of nowhere. One thing was clear though – Teams sits inside the Office 365 Groups substrate. Meeting notes are a great place to capture and share notes before, during, and after a Teams meeting. A few things to keep in mind: Only people in the same org as the meeting organizer will be able to start or access meeting notes. Office cheat sheets. Get up to speed in minutes, quickly refer to things you’ve learned, and master keyboard shortcuts. If you have trouble viewing these PDFs, install the free Adobe Acrobat Reader DC. To schedule a meeting, open Outlook and switch to the calendar view. Click New Teams Meeting at the top of the view. Add your invitees to the Required or Optional field (s)—you can even invite entire contact groups (formerly known as distribution lists). Add your meeting subject, location, start time, and end time. If you are using an Office Outlook installation from the Microsoft Store, the Teams meetings add-in isn't supported. You may kindly try using the method suggested above to close Outlook and Teams, restart Teams and sign-in, then restart Outlook client, perform these actions in specific order to see if it works.

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Tip

Watch the following session to learn how Teams interacts with Azure Active Directory (AAD), Microsoft 365 Groups, Exchange, SharePoint and OneDrive for Business: Foundations of Microsoft Teams

For the full Teams experience, every user should be enabled for Exchange Online, SharePoint Online, and Microsoft 365 Group creation.

Users' Exchange mailboxes can be hosted online or on-premises.

Users hosted on Exchange Online or Exchange Dedicated vNext can use all the features of Teams. They can create and join teams and channels, create and view meetings, call and chat, modify user profile pictures (if the Outlook on the web mailbox policy allows them to do so), and add and configure connectors, tabs, and bots. For a more comprehensive list of available features, see the table below.

Users hosted on Exchange Online Dedicated (Legacy) must be synchronized to Azure Active Directory on Microsoft 365 or Office 365. They can create and join teams and channels, add and configure tabs and bots, and make use of the chat and calling features. However, they cannot modify profile pictures, manage meetings, access outlook contacts, or manage connectors.

Important

For integration with on-premises, it's highly recommended that you have an Exchange full Classic Hybrid deployment with Exchange Server 2016 or later. Modern Hybrid support is limited to Free/Busy and will not provide calendar integration from Teams to mailboxes on-premises, for example. For more information about setting up a hybrid deployment, see Exchange Server hybrid deployments.

Users with mailboxes hosted on-premises must be synchronized to Azure Active Directory. They can make use of all the features in the above scenario, but additionally, they can manage meetings if the requirements listed on Requirements for mailboxes hosted on-premises section are met.

The following table provides a helpful quick reference to feature availability based on the Exchange environment.

Actions supported:

User's mailbox is hosted in:eDiscoveryLegal HoldRetentionTeam and Channel mgmtCreate and view meetings in TeamsModify user profile pictureCall HistoryManage ContactsAccess Outlook contactsVoicemailAdd and configure connectorsAdd and configure tabsAdd and configure bots
Exchange OnlineYes 1Yes 1YesYesYesYes7YesYesYes 6YesYesYesYes
Exchange Online Dedicated vNextYes 1Yes 1YesYesYesYes7YesYesYes 6YesYesYesYes
Exchange Online Dedicated – Legacy (Sync to Azure AD required)Yes 1Yes 1,2Yes 3YesNoNoYesYesNoYes 4Yes 5YesYes
Exchange On-premises (Sync to Azure AD)Yes 1,9Yes 1Yes 3YesYes 8NoYesYesNoYes 4Yes 5YesYes

1 eDiscovery and Legal Hold for compliance on channel messages is supported for all hosting options.

2 Teams private chat messages are not yet supported for Legal Hold for this hosting option.

3 Retention will use a shadow mailbox for the online user to store messages.

4 Teams users with on-premises Exchange mailbox may use voicemail with Teams and receive voicemail messages in Outlook, but voicemail messages will not be available to view or play within the Teams client.

5 If one of the owners of a team can add connectors, everyone else in that team will be able to do so, even if their mailboxes are homed on-premises.

6 Only contacts in default contacts folder. Access to other contacts folders or sub-folders is not supported.

7 Teams honors the Outlook on the web mailbox policy setting that's configured by tenant admins to control whether users can change their profile picture. If the -SetPhotoEnabled setting is turned off in the policy, users cannot add, change, or remove their profile picture, so the porfile picture wont be synced to teams if the admin changes the photo.8 You need to meet the requirements listed in the Requirements to create and view meetings for mailboxes hosted on-premises section.

9 A minimum of an Exchange Online Plan 1 license is also required. For more information, see Search for Teams chat data for on-premises users.

Requirements to get the most out of Microsoft Teams

Microsoft Teams works with several Microsoft 365 and Office 365 services to provide users with rich experience. To support this experience, you need to enable certain features or services and assign licenses.

  • Users must be assigned an Exchange Online license.

  • SharePoint Online is required to share and store files in team conversations. Microsoft Teams doesn't support SharePoint on-premises.

  • Users must be assigned a SharePoint Online license if they want to share files in Chats. If users aren't assigned and enabled with SharePoint Online licenses, they don't have OneDrive for Business storage in Microsoft 365 or Office 365. File sharing will continue to work in Channels, but users are unable to share files in Chats without OneDrive for Business storage in Microsoft 365 or Office 365.

  • Users must be enabled for Microsoft 365 group creation to create teams in Microsoft Teams.

    Important

    If you uninstall the Skype for Business client after you move a user to Teams Only mode, presence may stop working in Outlook and other Office apps. Presence works fine in Teams. To resolve this issue, select your profile picture in the top right-hand corner of Microsoft Teams and then select Settings. On the General tab under Application, select Register Teams as the chat app for Office (requires restarting Office applications). After you select this option, close and re-open all Office apps, including Outlook. After you open Outlook, presence information will be available.

Requirements to create and view meetings for mailboxes hosted on-premises

If mailboxes are hosted on-premises, to create and view meetings, the following requirements must be met:

  • The required Teams license needs to be assigned for the Azure Active Directory synced user.

  • Users must be synchronized to Azure Active Directory. For information about how to use Azure AD Connect to synchronize with Azure Active Directory, see Hybrid identity documentation.

  • Mailboxes are hosted in Exchange Server 2016 Cumulative Update 3 or later.

  • Autodiscover and Exchange Web Services is published externally.

  • OAuth authentication is configured preferably via the Exchange Hybrid Configuration Wizard running a full hybrid configuration (Classic or Modern). If you are not able to use the Hybrid Configuration Wizard, configure OAuth as described in Configure OAuth authentication between Exchange and Exchange Online organizations.

    Note

    Exchange trusts OAuth Token from Teams service which is known as EvoSTS. Step 1 should be enough, but just the EvoSTS; ACS is used for Free/Busy lookup in the calendar.

  • The checkbox for the Exchange Hybrid Deployment feature in Azure AD Connect is set.

  • For calendar app support and Teams Outlook Add-In for Mac, Exchange Web Service URLs must be configured as SPNs in Tenant Azure AD for the Exchange Service Principal. This step is done with Hybrid Configuration Wizard or following manual steps for Hybrid Modern Authentication.

To enable calendar delegation for these users:

  • You must also complete steps as described in Configure Integration and OAuth between Skype for Business Online and Exchange Server; these steps will provide the Teams scheduling application the required permissions to confirm delegate permissions.

    Note

    Step 2 includes role assignment for ArchiveApplication, which is not required for delegation.

  • The Teams Scheduling add-in for Outlook requires Exchange 2013 CU19 or later when scheduling a meeting on behalf of someone else. This is to support the unauthenticated discovery of the mailbox by our service to check delegate permissions against the delegator mailbox. The delegate and delegator location could be Exchange 2013 or later, or Exchange online, but Autodiscover must resolve to Exchange 2013 CU19 or later.

Additional considerations

Here are some extra things to think about as you implement Microsoft Teams in your organization.

  • In Microsoft Teams, security and compliance features like eDiscovery, Content Search, archiving, and legal hold work best in Exchange Online and SharePoint Online environments. For channel conversations, messages are journaled to the group mailbox in Exchange Online, where they're available for eDiscovery. If SharePoint Online and OneDrive for Business (using work or school account) are enabled across the organization and for users, these compliance features are available for all files within Teams as well.

  • Control and protect the configuration of compliance policies in Teams and Exchange using Conditional Access. For more information see How do Conditional Access policies work for Teams?

  • If your organization has compliance requirements to ensure all meeting discussions are discoverable, you should disable private meetings if the organizer has an Exchange on-premises mailbox. For more information, see Allow scheduling private meetings.

  • In an Exchange hybrid deployment, content from chat messages is searchable regardless of whether chat participants have a cloud-based mailbox or an on-premises mailbox. To learn more, read Searching cloud-based mailboxes for on-premises users. To learn about searching for content in Teams, read Content Search in the Microsoft 365 Compliance Center.

  • For presence status, Microsoft Teams must check whether the mailbox is hosted on Exchange Online or on-premises. The service then decides where to access the mailbox. To enable the Teams service to check the mailbox location through the REST API call to the Exchange Online service, you have to deploy an Exchange hybrid environment by running the Exchange Hybrid Configuration wizard, as described in Create a hybrid deployment with the Hybrid Configuration wizard.

Troubleshooting

For a full troubleshooting guide on the topic, make sure to check out Troubleshoot Microsoft Teams and Exchange Server interaction issues.

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This article describes some of the limits, specifications, and other requirements that apply to Teams.

Teams and channels

FeatureMaximum limit
Number of teams a user can createSubject to a 250 object limit¹
Number of teams a user can be a member of1,000²
Number of members in a team25,0006
Number of owners per team100
Number of org-wide teams allowed in a tenant
Number of members in an org-wide team10,000
Number of teams a global admin can create500,000
Number of teams a Microsoft 365 or Office 365 organization can have500,000³
Number of channels per team200 (includes deleted channels)4
Number of Private channels per team30 (includes deleted channels)4
Number of members in a Private channel250
Maximum size of distribution list, security group or Office 365 group that can be imported in to a team3,500
Maximum number of members in an Office 365 group that can be converted to a team10,0006
Channel conversation post sizeApproximately 28 KB per post5

1 Any directory object in Azure Active Directory counts towards this limit. Global admins are exempt from this limit, as are apps calling Microsoft Graph using application permissions.

2 This limit includes archived teams.

3 To further increase the number of teams, you must contact Microsoft support and request further increase to the number of Azure Active Directory objects in your tenant. Increase is only made for real-life production scenarios.

4 Deleted channels can be restored within 30 days. During these 30 days, a deleted channel continues to be counted towards the 200 channel or 30 private channel per team limit. After 30 days, a deleted channel and its content are permanently deleted and the channel no longer counts towards the per team limit.

5 28 KB is an approximate limit because it includes the message itself (text, image links, etc.), @-mentions, number of connectors, and reactions.

6 Teams in GCC can accommodate 25,000 members but teams in GCCH/DoD can only accommodate 2,500 members. Further note that teams/channel mentions are blocked in teams with over 10,000 members.

Messaging

Chat

Users who participate in conversations that are part of the chat list in Teams must have an Exchange Online (cloud-based) mailbox for an admin to search chat conversations. That's because conversations that are part of the chat list are stored in the cloud-based mailboxes of the chat participants. If a chat participant doesn't have an Exchange Online mailbox, the admin won't be able to search or place a hold on chat conversations. For example, in an Exchange hybrid deployment, users with on-premises mailboxes might be able to participate in conversations that are part of the chat list in Teams. However, in this case, content from these conversations isn't searchable and can't be placed on hold because the users don't have cloud-based mailboxes. (For more, see How Exchange and Microsoft Teams interact.)

Teams chat works on a Microsoft Exchange backend, so Exchange messaging limits apply to the chat function within Teams.

FeatureMaximum limit
Number of people in a private chat12502
Number of people in a video or audio call from chat20
Number of file attachments310
Chat sizeApproximately 28 KB per post4

1 If you have more than 20 people in a chat, the following chat features are turned off: Outlook automatic replies and Teams status messages; typing indicator; video and audio calling; sharing; read receipts. The 'Set Delivery Options' button (!) is also removed when private group chats contain more than 20 members.

2 Only 200 members at a time can be added to a group chat. See this article for more information.

3 If the number of attachments exceeds this limit, you'll see an error message.

4 28 KB is an approximate limit because it includes the message itself (text, image links, etc.), @-mentions, and reactions.

Emailing a channel

If users want to send an email to a channel in Teams, they use the channel email address. When an email is part of a channel, anyone can reply to it to start a conversation. Here are some of the applicable limits for sending email to a channel.

FeatureMaximum limit
Message size124 KB
Number of file attachments220
Size of each file attachmentLess than 10 MB
Number of inline images250

1 If the message exceeds this limit, a preview message is generated and the user is asked to download and view the original email from the link provided.

2 If the number of attachments or images exceeds this limit, you'll see an error message.

For more information, see Exchange Online limits.

Note

Message size, file attachments, and inline images limits are the same across all Microsoft 365 and Office 365 licenses. Emailing a channel is not available in Teams for Office GCC/GCCH/DOD organizations.

Channel names

Channel names can't contain the following characters or words:

TypeExample
Characters~ # % & * { } + / : < > ? ' ' , ..
Characters in these ranges0 to 1F
80 to 9F
Wordsforms, CON, CONIN$, CONOUT$, PRN, AUX, NUL, COM1 to COM9, LPT1 to LPT9, desktop.ini, _vti_

Channel names also can't start with an underscore (_) or period (.), or end with a period (.).

Meetings and calls

Important

Microsoft 365 live event limit increases

To continue supporting our customers' needs, through June 30, 2021, we will extend temporary limit increases for live events, including:

  • Event support for up to 20,000 attendees
  • 50 events can be hosted simultaneously across a tenant
  • Event duration of 16 hours per broadcast

Additionally, Live Events with up to 100,000 attendees can be planned through the Microsoft 365 assistance program. The team will assess each request and work with you to determine options that may be available. Learn more.

FeatureMaximum limit
Number of people in a meeting (can chat and call in)300. View-only allows for up to 10,000 listen-only participants to join a meeting in which the organizer has a license for E3/E5/A3/A5 SKU, as well as, Government (GCC, GCC High, DoD). Learn more about the View-only experience.
Number of people in a video or audio call from chat20
Max PowerPoint File Size2GB
Teams keeps meeting recordings that don't get uploaded to Microsoft Stream, available for local download20 days

Meeting expiration

Note

A meeting URL will never stop working. The expiry only relates to any PSTN dial-in numbers and/or underlying meeting policies and settings.

Meeting typeMeeting expires after this much timeEach time you start or update a meeting, expiration extends by this much time
Meet nowStart time + 8 hoursN/A
Regular with no end timeStart time + 60 days60 days
Regular with end timeEnd time + 60 days60 days
Recurring with no end timeStart time + 60 days60 days
Recurring with end timeEnd time of last occurrence + 60 days60 days

Note

Microsoft Teams meetings have a time limit of 24 hours.

Teams Live Events

Outlook 365 Teams Status

FeatureMaximum limit
Audience size10,000 attendees
Duration of event4 hours
Concurrent Live Events running in a Microsoft 365 or Office 365 organization 115

1 You can schedule as many Live Events as you want, but you can only run 15 at a time. As soon as the producer joins a live event, it's considered to be running. The producer who attempts to join the 16th live event gets an error.

For more information about live events and a comparison of Teams live events to Skype Meeting Broadcast, go to Teams live events and Skype Meeting Broadcast. See also Schedule a Teams live event.

Important

Microsoft 365 live event limit increases

To continue supporting our customers' needs, through June 30, 2021, we will extend temporary limit increases for live events, including:

Login
  • Event support for up to 20,000 attendees
  • 50 events can be hosted simultaneously across a tenant
  • Event duration of 16 hours per broadcast

Additionally, Live Events with up to 100,000 attendees can be planned through the Microsoft 365 assistance program. The team will assess each request and work with you to determine options that may be available. Learn more.

Presence in Outlook

Teams presence in Outlook is supported on the Outlook 2013 desktop app and later. To learn more about presence in Teams, see User presence in Teams.

Storage

Each team in Microsoft Teams has a team site in SharePoint Online, and each channel in a team gets a folder within the default team site document library. Files shared within a conversation are automatically added to the document library, and permissions and file security options set in SharePoint are automatically reflected within Teams.

Note

Each private channel has its own SharePoint site (previously called 'site collection').

If you don't have SharePoint Online enabled in your tenant, Microsoft Teams users cannot always share files in teams. Users in private chat also cannot share files because OneDrive for Business (which is tied to the SharePoint license) is required for that functionality.

By storing the files in the SharePoint Online document library and OneDrive for Business, all compliance rules configured at the tenant level will be followed. (For more, see How SharePoint Online and OneDrive for Business interact with Microsoft Teams.)

Because Teams runs on a SharePoint Online backend for file sharing, SharePoint limitations apply to the Files section within a Team. Here are the applicable storage limits for SharePoint Online.

FeatureMicrosoft 365 Business BasicMicrosoft 365 Business StandardOffice 365 Enterprise E1Office 365 Enterprise E3Office 365 Enterprise E5Office 365 Enterprise F1
Storage1 TB per organization plus 10 GB per license purchased1 TB per organization plus 10 GB per license purchased1 TB per organization plus 10 GB per license purchased1 TB per organization plus 10 GB per license purchased1 TB per organization plus 10 GB per license purchased1 TB per organization
Storage for Teams FilesUp to 25 TB per site or groupUp to 25 TB per site or groupUp to 25 TB per site or groupUp to 25 TB per site or groupUp to 25 TB per site or groupUp to 25 TB per site or group
File upload limit (per file)100 GB100 GB100 GB100 GB100 GB100 GB

Channels are backed by folders within the SharePoint Online site (previously called 'site collection') created for the team, so file tabs within Channels share the storage limits of the team they belong to.

For more information, see SharePoint Online limits.

Class teams

Microsoft Teams for Education provides templates designed for unique education scenarios, such as classroom teaching. More information about team types, including class teams, is available in Choose a team type to collaborate in Microsoft Teams.

A class team is a template type with additional apps included, and with limits separate to the number of team members.

Note

Using class teams requires an Office 365 Education license.

Limits for class teams are listed in the following table:

FeatureMaximum limit
Number of members in a teamSee the Teams and channels section of this article
Number of members to use Assignments in a class team200
Number of members to use a OneNote Class Notebook in a class team200

A class team can support more than 200 members. However, if you plan to use either the Assignments app or Class Notebook app within your team, you will need to keep the number of members below the maximum limits above.

Tags

FeatureMaximum limit
Number of tags per team100
Number of suggested default tags per team25
Number of team members assign to a tag100
Number of tags assigned to a user per team25

Contacts

Teams uses these contacts:

  • Contacts in your organization's Active Directory
  • Contacts added to the user's Outlook default folder

Teams users can communicate with anyone in your organization's Active Directory and can add anyone in your organization's Active Directory as a contact and to their contact lists by going to Chat > Contacts or Calls > Contacts.

Teams users can also add a person who isn't in your organization's Active Directory as a contact by going to Calls > Contacts.

Browsers

Teams fully supports the following Internet browsers, with noted exceptions for calling and meetings. This table applies to operating systems running on desktop computers.

BrowserCalling - audio, video, and sharingMeetings - audio, video, and sharing123
Internet Explorer 11Not supportedMeetings are supported only if the meeting includes PSTN coordinates. To attend a meeting on IE11 without PSTN coordinates, users must download the Teams desktop client.
Video: Not supported
Sharing: Incoming sharing only (no outgoing)
Microsoft 365 apps and services will not support Internet Explorer 11 starting August 17, 2021 (Microsoft Teams will not support Internet Explorer 11 earlier, starting November 30, 2020). Learn more. Please note that Internet Explorer 11 will remain a supported browser. Internet Explorer 11 is a component of the Windows operating system and follows the Lifecycle Policy for the product on which it is installed.
Microsoft Edge, RS2 or laterFully supported, except no outgoing sharing4Fully supported, except no outgoing sharing
Microsoft Edge (Chromium-based), the latest version plus two previous versionsFully supportedFully supported
Google Chrome, the latest version plus two previous versionsFully supportedFully supported
Sharing is supported without any plug-ins or extensions on Chrome version 72 or later.
Safari 14+1:1 calls not supported. Group calls fully supported.
Video: Fully supported
Sharing: Fully supported
Meetings: Fully supported
Video: Fully supported
Sharing: Fully supported
Safari 13.1+1:1 calls not supported. Group calls supported with full audio support.
Video: Incoming only
Sharing: Fully supported
Meetings are supported with full audio support.
Video: Incoming only
Sharing: Fully supported
Firefox, the latest version plus two previous versionsNot supportedMeetings are supported only if the meeting includes PSTN coordinates. To attend a meeting on Firefox without PSTN coordinates, users must download the Teams desktop client.
Video: Not supported
Sharing: Incoming sharing only (no outgoing)
Safari versions before 13Not supportedMeetings are supported only if the meeting includes PSTN coordinates. To attend a meeting on Safari without PSTN coordinates, users must download the Teams desktop client.
Video: Not supported
Sharing: Incoming sharing only (no outgoing)
Safari is enabled on versions higher than 11.1 in preview. While in preview, there are known issues with Safari's Intelligent Tracking Prevention.

Link Teams To Outlook Calendar

1 To give and take control of shared content during sharing, both parties must be using the Teams desktop client. Control isn't supported when either party is running Teams in a browser. This is due to a technical limitation that we're planning to fix.

2 Blur my background isn't available when you run Teams in a browser. This feature is only available in the Teams desktop client.

3 Teams meetings on browsers are limited to a single incoming video feed of active speaker.

4 Edge RS2 or later doesn't support sending real-time audio and video traffic through HTTP proxies.

Note

Outlook 365 Teams

As long as an operating system can run the supported browser, Teams is supported on desktop computers. For example, running Firefox on the Linux operating system is an option for using Teams.

For mobile operating systems, we recommend that you run the Teams app, available from the Android and iOS stores. Running Teams in a mobile operating system is supported, but many features are unavailable.

Operating systems

Microsoft Outlook 365 Teams

For information about operating system requirements, see Get clients for Microsoft Teams.