Just a simple one-liner

When you have many room mailboxes, granting someone access to each room calendar one-by-one is painful. This one-liner reads a list of room SMTP addresses from a text file and applies the same permission to each mailbox calendar.

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Get-Content .\rooms.txt | % {
  Write-Host "Working on $_" -ForegroundColor Cyan
  Add-MailboxFolderPermission -Identity "$($_.Trim()):\Calendar" -User "[email protected]" -AccessRights Reviewer
}

Notes

  • Text file we import via Get-Content contains a room email address per line
  • .Trim is being used to remove blank spaces in TXT file - (’ [email protected]’ -> ‘[email protected]’) - it’s just a safety feature I like to use
  • In some tenants, the calendar folder name might be localized (for example “Kalendarz” in Poland, “Kalender” in Germany and “Calendier” for France)
  • If permissions are already granted for an user, you need to either remove these and re-add or use Set-MailboxFolderPermissions