Share to Teams from Outlook
Share to Teams from Outlook (Share to Teams) enables users to share emails, including attachments, from Outlook to any chat or channel in Teams.
Outlook add-in for Share to Teams
The Share to Teams feature requires an add-in for Outlook. This add-in is installed automatically whenever a user logs on to either the Teams Web app or the Teams desktop client.
Be sure to review Add-ins for Outlook in Exchange Online and Client Access Rules in Exchange Online to make sure your add-ins for Outlook function correctly. Also, disabling connected experiences can prevent add-ins for Outlook from working properly. See Connected experiences in Office for more information. Shared mailboxes are not supported by the add-in.
Share to Teams uses the same transport mechanism as when a user emails a channel. For sharing to chats, emails (including email attachments) are copied to the sender's OneDrive. For sharing to channels, emails and attachments are copied to the Email messages folder in SharePoint.
The Outlook add-in for Share to Teams uses requirement set 1.7, as detailed in Outlook add-ins documentation and Outlook add-in API requirement set 1.7, which include details on Outlook add-ins, environment requirements for Outlook add-ins, and the specific Outlook clients that are supported with requirement set 1.7.
Enabling or disabling Share to Teams
The Outlook add-in for Share to Teams can be selectively disabled or enabled on a per-user basis using the following PowerShell cmdlets.
Disabling the add-in is only possible after the add-in has been installed. If you would like to enforce disabling for all users in your tenant, run a script periodically.
To disable the add-in for Outlook used by Share to Teams, run the cmdlet found here.
To enable the add-in for Outlook used by Share to Teams, run the cmdlet found here.
Browsers and Single Sign-on
Share to Teams, in both Outlook on the web and Outlook desktop clients, relies on a browser WebView. See Browsers used by Office Add-ins for details on which clients use which specific browsers.
Share to Teams requires both third-party cookies and local storage access to be enabled for users' browsers.
Share to Teams uses Single Sign-on (SSO), which means users don't need to provide their credentials when using the add-in via Share to Teams. SSO for Outlook on the web supports https://outlook.office365.com/owa/extSSO.aspx and https://outlook.office.com/owa/extSSO.aspx reply URLs by default. For vanity domains, administrators need to add the appropriate Microsoft Entra ID reply URL.