On Exchange the following error was logged multiple times every minute:
- A folder is being scoped by a search which no longer exists. This may result in failures or errors when attempting to update the folder contents.
To fix this error, run a mailbox repair as follows:
- New-MailboxRepairRequest -Mailbox <Emailaddress> -CorruptionType SearchFolder
Give it a few min and you should see 3 informational alerts about the completion.
Hope it helps.