"Illegal xml character" due to corrupt item in Exchange mailbox

[Jason-TNS]

I am seeing the below error when I try to open the job log for our Exchange backup job:

Illegal xml character. 

52: D:\Program Files\VERITAS\Backup Exec\NT\Data\BEX_SQL_06205.xml

I can see that this is because of the name of a Exchange mailbox that supposedly has corrupt items in it.  I deleted all other "corrupt" items from mailboxes that the BackupExec log was referring to, but can't get rid of the corruption error that is rerring to a cryptic mailbox name that does not show in Exchange System Manager, therefore I can not delete this item. 

WARNING: "\\EXCHANGE\Microsoft Exchange Mailboxes\ 䅁A05E32AC6CF67C108389F268FBC431B468AB5540C16282F5" is a corrupt file.
This file cannot verify.
Warning: Unable to backup the attachment data associated with one or more messages. Some messages and their attachments may have been deleted while the backup was already in progress.

Please advise us on how to clear this message and if this is something to be concerned with.  Thanks.

[shb]

I get the same error and I too can't seem to find the 'corrupt' mailbox.

This thread is about the same error https://forums.symantec.com/syment/board/message?board.id=103&message.id=55530

You can delete the illegal xml characters from line 52 in your XML file D:\Program Files\VERITAS\Backup Exec\NT\Data\BEX_SQL_06205.xml (probably just a square or two) and afterwards open the log and read it with fine colors and tables.

[terramark]

After a month of off and on dealing with this issue I was finally able to read the logs and trace the corrupt attachments to the sync issues/server failures folder of a mailbox for a particular user. Turns out this user had an Outlook rule that was broken. I deleted all the email in the server failures folder and now my backup reports are readable again.