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 members in a team 5,000
Number of members in an org-wide team 5,000
Number of teams a global admin can create 500,000
Number of teams an Office 365 tenant can have 500,000
Number of channels per team 200 (includes deleted channels)

¹Any 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.

Meetings and calls

Feature Maximum limit
Number of people in a meeting 250
Number of people in a private chat 50

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.

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 Office 365 Business Essentials Office 365 Business Premium 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 15 GB 15 GB 15 GB 15 GB 15 GB 15 GB

Each Files tab in Teams runs on a SharePoint Online backend, so the storage limits above apply to each Channel within a Team.

For more information, see SharePoint Online limits.

Messaging

Users who participate in conversations that are part of the Chat list in Microsoft 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 Microsoft 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.)

Microsoft Teams chat function works on a Microsoft Exchange backend, so you can apply the Exchange messaging limits to the chat function within Microsoft Teams. If users want to send an email to a channel in Teams, they use the channel email address. Once 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 Office 365 Enterprise E1 Office 365 Enterprise E3 Office 365 Enterprise E5 Office 365 Enterprise F1
Message size limit † 25 KB 25 KB 25 KB 25 KB
File attachments limit ‡ 10 10 10 10
Inline images limit ‡ 50 50 50 50

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

‡ If the number of attachments or images exceeds this limit, the message will not be processed and an NDR e-mail will be sent back to the sender notifying them of the error.

For more information, see Exchange Online limits.

Browsers

Teams fully supports the following internet browsers, with noted exceptions.

Browser Notes
Internet Explorer 11 Calling and Meetings aren't supported. Users who try to join a meeting on Internet Explorer 11 will be directed to download the Teams desktop client.
Microsoft Edge Calling and Meetings supported on Edge RS2 or later
Chrome, the latest version plus two previous versions Meetings supported on Chrome 59 or later
Support for Calling is coming soon
Firefox, the latest version plus two previous versions Calling and Meetings aren't supported. Users who try to join a meeting on Firefox will be directed to download the Teams desktop client. 
Safari 11.1+ Safari is enabled on versions higher than 11.1 in preview. While in preview, there are known issues with Safari's Intelligent Tracking Prevention.

Note

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

Operating systems

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