If you are using CA ARCserve for your backups in your corporate environment for Exchange Server backups whether this will be on a document level, i.e. individual mailboxes or a brick level, which generally covers just the entire Exchange database.

You probably have come across or will come at some point to seeing a failed backup job in ARCserve backup stating the following;

AW9621 Failed to back up 1 mailboxes.

This can be quite annoying as it does not give you much to go by, what mailbox failed and when and how, doing a google.com search on this error will eventually land you at CA’s official documentation stating what the error code is and then states to consult the Exchange logs generated by the Agent on the Exchange server.

After some searching and digging I eventually found the location of the logs where this might be of some use, the logs are situated on the Exchange server at this location, %Program Files%\CA\ARCServe Backup Agent for Microsoft Exchange Server\LOG

Once you’re in that location, you’ll find a skipreport.log file, the filename can vary, but should contain something with ‘Skipreport” in its’ filename, this in my case indicated which mailbox was skipped and at what time, doesn’t state why though unfortunately but should give you some more details to go by.