A customer complained about Snapmanager for Exchange (NetApp) not working. The following error was in the eventlog:
Microsoft says the following about this:
Probably so rights issues on the mailbox. On the internet I found a script that the Mailbox GUID
turnover to the user. Download this script here : MbxGUIDtoMbxName
Give the GUID and the script gives the user name.
In this case there were rights to an Outlook folder from someone who was already out of service