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There is a SharePoint Site with a Site Mailbox App. How can one control who has access to this app? Can permissions be changed/broken? If permissions cannot be changed which permissions are inherited from parent?

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Short answer, this app inherits permissions from the site hosting it. Check article on SharePoint Mailbox App permissions:

Task: Read, organize, reply to, or delete email from the site mailbox in SharePoint.


  • Anyone in the default owners group or the default members group for the site (anyone with Contribute permissions) can use the site mailbox from SharePoint. People can be listed in the owners or members group as individuals or as part of a security group.
  • External team members can’t access a site mailbox.
  • Each person must have a license for both SharePoint and Exchange in the same Office 365 subscription.
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