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 1,000
Number of members in a team 5,000
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 an Office 365 tenant can have 500,000²
Number of channels per team 200 (includes deleted channels)³
Number of Private channels per team 30

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

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 100
Number of file attachments2 10

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.

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

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 Office 365 licenses.

Channel names

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

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

Feature Maximum limit
Number of people in a meeting 250
Max PowerPoint File Size 2GB

Teams live events

Feature Maximum limit
Audience size 10,000 attendees
Duration of event 4 hours
Concurrent live events in an Office 365 tenant 15

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.

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.

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 (per file) 15 GB 15 GB 15 GB 15 GB 15 GB 15 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.

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.

Browser Calling - audio, video, and sharing Meetings - audio, video, and sharing
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 Edge, RS2 or later Fully supported, except no outgoing sharing 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.
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 11.1+ 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.

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.