2003 to 2010 migration cleanup question

In the home stretch of our migration at this point. Accounts in several affiliate domains are impacted. The mailboxes still in 2003 stores are most likely orphaned but we need to be sure. Taking into account managers with permissions to mailboxes of terminated employee's, I'm looking for the best way to verify that a mailbox is not needed and can be passed over for migration. Monitoring software has caused last accessed time to be updated so I can't use that.

Thanks in advance!
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hvdhelmConnect With a Mentor Commented:
You can enable mailbox logging:

So you can track who is accessing which mailbox. The way you can also filterout your monitoring tools.
Ben HartCommented:
How many mailboxes are you talking about here?  Any issue with manually opening each one to verify any forwarding or extra users listed in the security tab for full access?
Boston49Author Commented:
Thats the problem, around 3,300 mboxes to consider. Many of them are group mailboxes. One option is to disconnect access to the remainder and wait for the screams. We're fairly certain that these mailboxes will not be missed. Just need to be sure if possible.
Simplest way to do something is usually the best - the most effective way to determine this is to use the "people monitoring" - Disable one at a time and see who complains.
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