Mailbox Last logged on By NT AUTHORITY\SYSTEM (XCHG 2003 Server)

Why is it that one of my Exchange 2003 mailboxes constantly shows "Last Logged on By" NT AUTHORITY\SYSTEM when every other user's mailbox shows Last Logged on By the actual user, or by Backup Exec if the user hasn't accessed his/her mailbox since last backup.  Does this indicate that something is amiss?
harkinj1Asked:
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wtp_isscCommented:
This is normal. Anytime a system process is called against a message store or programs such as a virus scan will leave the same name behind.
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harkinj1Author Commented:
Thanks for answering so quickly.
But why the same user mailbox - Always and only!
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wtp_isscCommented:
I'm guessing you don't access it often, because when I look through my system everyone who is gone today shows that NT authority account as the last logged in.  
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harkinj1Author Commented:
Well, this one belongs to my president, so it's accessed frequently internally and externally.  In my org, those mailboxws are not accessed in days always show my backup software last accessing - never NT\AUTH.  Just one of those things, I guess.  Thanks wtp.  :)  -Jamie
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