Calendar items missing after exchange migration

Migrated email from exchange 2007 to exchange 2010 .  Everything seems fine except a user told me some of her items in her calendar from earlier in the year are missing. I turned the old server back on as I hadn't decommissioned it yet and she said they are now back. Another user also said older calendar events that were sent from someone else were missing ( all the ones he had put in were still there)  Is there something I need to do to transfer older calendar items over?  I did go to System public folders and under free/ busy I went to the replication tab and put the new server public folder in there.  I have no idea how to tell if it was successful or not or if that would have even fixed it or not. Any ideas?
jtanoAsked:
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Chad SmithConnect With a Mentor Commented:
Maybe there was a departmental/group calendar that did not migrate? In the Exchange Management shell, run
Get-PublicFolder -Recurse

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or
Get-PublicFolder \NON_IPM_SUBTREE -Recurse 

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on the old server and the new server and compare that output to see if the old server has items the new server doesn't.
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vSolutionsITCommented:
Confirm if you have performed all steps mentioned in below article to complete the public folder migration.

http://justaucguy.wordpress.com/2012/07/19/public-folder-replicas-moving-from-2007-to-2010/
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jtanoConnect With a Mentor Author Commented:
Sorry I took so long to get back. It turns out they archived it into a pst file and didn't know it. I didn't think to look there because we don't really use archiving.  I ran the Get-PublicFolder \NON_IPM_SUBTREE -Recurse  on old and new server and they both have the same lists.


As far as the second article, I couldn't get the commands to run, so once I figure out how to get to the correct path, I will try it, but I followed another article to migrate them over using more the gui aspect rather than the shell. I suck using shell. Thanks for your comments.
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jtanoAuthor Commented:
Found that the users archived their information, thinking they had lost it in the migration.  We don't promote or use archiving in outlook, so I didn't thing to look their first.
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