Last logged on by does not mean the user actually accessed the mailbox. There are many reasons why that filed can be populated, for legitimate reasons - like calendar lookups.
If another mailbox is access by someone other than the user then it should be logged in the event viewer, although I cannot remember if you have to turn up diagnostic logging to get that level of logging.
Simon.
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by: Rajith_EnchiparambilPosted on 2009-05-29 at 08:49:51ID: 24503626
Are you using admin account for backup. If that is the case, this will happen.
You could try free tools like Exmon or third party like Message Stats which will give detailed reporting.