Limits and specifications for Microsoft Teams

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

Teams and channels

Feature Maximum limit
Number of teams a user can create Subject to a 250 object limit¹
Number of teams a user can be a member of 1,000²
Number of members in a team 10,0005
Number of owners per team 100
Number of org-wide teams allowed in a tenant 5
Number of members in an org-wide team 5,000
Number of teams a global admin can create 500,000
Number of teams a Microsoft 365 or Office 365 organization can have 500,000²
Number of channels per team 200 (includes deleted channels)³
Number of Private channels per team 30 (includes deleted channels)³
Number of members in a Private channel 250
Maximum number of members in an Office 365 group that can be converted to a team 10,0005
Channel conversation post size Approximately 28 KB per post4

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. To go beyond the maximum number of teams a Microsoft 365 or Office 365 organization can have, you must contact Microsoft support.

3 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.

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

5 Teams in GCC can only accommodate 5,000 members and teams in GCCH/DoD can only accommodate 2,500 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.

Feature Maximum limit
Number of people in a private chat1 250
Number of people in a video or audio call from chat 20
Number of file attachments2 10
Chat size Approximately 28 KB per post3

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

3 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.

Feature Maximum limit
Message size1 24 KB
Number of file attachments2 20
Size of each file attachment Less than 10 MB
Number of inline images2 50

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:

Type Example
Characters ~ # % & * { } + / \ : < > ? | ' " , .
Characters in these ranges 0 to 1F
80 to 9F
Words forms, 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 help support our customers, through January 1, 2021, we will extend temporary limit increases for Live Events hosted in Teams, Stream, and Yammer, including:

  • Up to 20,000 attendees per event
  • Up to 50 simultaneous events per Teams tenant
  • Up to 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. After January 1, 2021, customers who need these limit increases will be required to purchase the Advanced Communications add-on.

Feature Maximum limit
Number of people in a meeting (can chat and call in) 350
Number of people in a video or audio call from chat 20
Max PowerPoint File Size 2 GB
Teams keeps meeting recordings that don't get uploaded to Microsoft Stream, available for local download 20 days

Note

The change from using Microsoft Stream to OneDrive for Business and SharePoint for meeting recordings will be a phased approach. At launch you'll be able to opt-in to this experience, in November you'll have to opt-out if you want to continue using Stream, and some time in early 2021 we'll require all customers to use OneDrive for Business and SharePoint for new meeting recordings.

Meeting expiration

Meeting type Meeting expires after this much time Each time you start or update a meeting, expiration extends by this much time
Meet now Start time + 8 hours N/A
Regular with no end time Start time + 60 days 60 days
Regular with end time End time + 60 days 60 days
Recurring with no end time Start time + 60 days 60 days
Recurring with end time End time of last occurrence + 60 days 60 days

Note

Microsoft Teams meetings have a time limit of 24 hours.

Teams Live Events

Feature Maximum limit
Audience size 10,000 attendees
Duration of event 4 hours
Concurrent Live Events running in a Microsoft 365 or Office 365 organization 1 15

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 help support our customers, through January 1, 2021, we will extend temporary limit increases for Live Events hosted in Teams, Stream, and Yammer, including:

  • Up to 20,000 attendees per event
  • Up to 50 simultaneous events per Teams tenant
  • Up to 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. After January 1, 2021, customers who need these limit increases will be required to purchase the Advanced Communications add-on.

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 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.

Feature Microsoft 365 Business Basic Microsoft 365 Business Standard Office 365 Enterprise E1 Office 365 Enterprise E3 Office 365 Enterprise E5 Office 365 Enterprise F1
Storage 1 TB per organization plus 10 GB per license purchased 1 TB per organization plus 10 GB per license purchased 1 TB per organization plus 10 GB per license purchased 1 TB per organization plus 10 GB per license purchased 1 TB per organization plus 10 GB per license purchased 1 TB per organization
Storage for Teams Files Up to 25 TB per site collection or group Up to 25 TB per site collection or group Up to 25 TB per site collection or group Up to 25 TB per site collection or group Up to 25 TB per site collection or group Up to 25 TB per site collection or group
File upload limit (per file) 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB

Channels are backed by folders within the SharePoint Online 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:

Feature Maximum limit
Number of members in a team See the Teams and channels section of this article
Number of members to use Assignments in a class team 200
Number of members to use a OneNote Class Notebook in a class team 200

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

Feature Maximum limit
Number of tags per team 100
Number of suggested default tags per team 25
Number of team members assign to a tag 100
Number of tags assigned to a user 25

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.

Browser Calling - audio, video, and sharing Meetings - audio, video, and sharing1 2 3
Internet Explorer 11 Not supported Meetings 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 later Fully supported, except no outgoing sharing4 Fully supported, except no outgoing sharing
Microsoft Edge (Chromium-based), the latest version plus two previous versions Fully supported Fully supported
Google Chrome, the latest version plus two previous versions Fully supported Fully supported

Sharing is supported without any plug-ins or extensions on Chrome version 72 or later.
Safari 13.1+ 1:1 calls not supported. Group calls supported with full audio support.

Video: Incoming only

Sharing: Incoming sharing only (no outgoing) 
Meetings are supported with full audio support.

Video: Incoming only

Sharing: Incoming sharing only (no outgoing). Note that only a user's entire display can be shared; sharing specific windows within a display is not available. 
Firefox, the latest version plus two previous versions Not supported Meetings 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 13 Not supported Meetings 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.

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

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

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