Calendar viewing permissions
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Ran into an issue with calendar permissions - one of my least favourite things to fix.
TL;DR:
Default settings for our company share all calendar entries in full to all domain users.
Created a few new users over the last month, none of them had their permissions set correctly. They were all set to "default" (correct) but with no permissions to view all details, it just showed the appointment times and listed them as "busy". There's a proper name for that level of viewing but I don't recall what it's called and if you care you can look it up.
Fix:
Set-MailboxFolderPermission #USERNAMEHERE#:\Calendar -User Default -AccessRights Reviewer
Why did this happen in the first place?
It's easy enough to fix, simple one liner powershell. I'd really like to not have to fix it ever again though.