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Once renamed, we tried to update the address book and restart the Mailbox Assistant service. The Fix After some more troubleshooting in the event logs and diagnostic logging, I noticed that the database copy for Database02, where to OAB mailbox resided, had one copy that was in a ‘Failed and Suspended’ state.
We tried to fix this copy and were unable to do so with a reseed or a resume.
The OAB mailbox can be deployed on a mailbox database that has multiple copies, thereby mitigating a failure mode that occurred in previous releases.” Ironic in that if the OAB generating mailbox resides in a database that has a failed copy, then it could potentially lead to failed downloads.
Exchange 2016 OAB After running into this issue, I fired up my Exchange 2016 RTM lab and I was able to reproduce the issue with a good copy and a failed and suspended copy of the database where the OAB generating mailbox is located.
I verified the file location manually but also noticed the date discrepancy (the blue rectangles in the above image) which shows the date the attempted download was made (upper left) and the date of the files (lower right).
Because the files were not changed recently the error message was downloaded and the client could not download the files.
Even tried restarting the Exchange Mailbox Assistant service without any luck.
Open up the latest log file in the directory and see what errors are being reported by the client.OAB generation is controlled by the mailbox assistant named OABGenerator Assistant that runs under the Microsoft Exchange Mailbox Assistants service.OAB generation occurs in a designated arbitration mailbox that has the . To change the OAB generation schedule, see Change the offline address book generation schedule in Exchange Server.This would leave the source database mounted and the destination (the second database copy) would end up in a “Failed and Suspended” state.What ended up happening is about a day later if a user tried to manually download the address book, they would not be able to and would get a 0x80190194 error: Troublshooting So what is this? Well, let’s look at the log files for OAB downloading.