Hi, I'm seeing the Event ID 9024 and 9025 pop up occasionally. Event ID 9042: Service MSExchangeMailboxAssistants. Calendar Sync Assistant for database Mailbox01 (564b2e31-a490-4415-8956-f1c2155c473f) is exiting a work cycle. No mailboxes were successfully processed. 9 mailboxes were skipped due to errors. There are 0 mailboxes in this database. Event ID 9025: Service MSExchangeMailboxAssistants. Calendar Sync Assistant skipped 9 mailboxes on database Mailbox01 (564b2e31-a490-4415-8956-f1c2155c473f). Mailboxes: (lists all 9 mailboxes here) The problem is that the mailboxes listed under 9025 have been removed. To be more specific, the user accounts have been mail disabled. The user account still exists in AD, but the mailbox itself has been disabled. AND, these 9 particular mailboxes were actually apart of an old database that has now been removed, but somewhere these users are still resident in Exchange... Or at least the Calendar Sync Assistant has some cached list or something that still doesnt' know these mailboxes are long gone. I've checked around and still found no resolution to this. JB

Hi , These 9 mailboxes host in this database now ? The following link for your reference. Event 9042 and 9025 after restoring mailbox database from another Exchange Organization<//span>: http://social.technet.microsoft.com/Forums/en/exchangesvrgeneral/thread/6a9a2657-1b97-4d3a-93ec-5182d6a51cecWendy Liu TechNet Community Support

No. These mailboxes no longer exist in our Exchange environment. They've been purged. They are no longer in the Disconnected mailbox section either. These mailboxes originally existed on our default database. Every mailbox has been moved off this database. These people left before i could move these 9 mailboxes from the Default database, so i ended up exporting them out and removing the 9 mailboxes completely. The default database has now been removed. But somehere, Exchange thinks these mailboxes are still resident somewhere. I checked the link and I ran the Get-Mailbox cmdlet and it didn't return any errors or warnings for mailboxes. His situation was that he had to restore a database and reconnect the mailboxes. I've removed these mailboxes and don't want them back. I just want Exchange to acknowledge they are gone for good and that the CalendarSync doesn't need to try to process anything. JB