Old calendar items being rescheduled not by user .. possible sync issue exchange 2010

Is it possible to trace a meeting schedule change (update) back to the device it was changed (sent) from in exchange 2010?     We have a user in which meetings that are 6 months old are being reschedule but they are not doing it.     So I assume it is some kind of sync issue on one of there devices.    However I am unsure how to trace this down to the device?
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JohnBusiness Consultant (Owner)Commented:
You should be able to determine that Outlook (Exchange) is accurate with respect to old meetings.

Then, in iPhone, I only sync about 10 days back. so on my device, old appointments are gone.  I suspect something similar has happened to your users' devices.

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Veerappan SundaramSenior Technical ConsultantCommented:
Enable Mailbox Auditing on couple of mailboxes, refer below:
you may need to enable auditing for Admin, Delegate and Owner.

Also use the CalCheck tool to check for any corruptions:
Zoldy2000Author Commented:
Not a direct answer but led us in the right direction
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Veerappan SundaramSenior Technical ConsultantCommented:
@zoldy2000 - For this kind of issues, there are N numbers of root causes and fixes.
So, guidelines to get to the root cause will help even in future for other relevant issues.

Note: Please update the root cause and the fix, in this forum. So that it will help someone in future.
Also mark the acceptable answer to close this question.
Zoldy2000Author Commented:
I did the best I could as the problem just went away.    So I do not know what the final resolve was.      I marked helpful because it was helpful information.
JohnBusiness Consultant (Owner)Commented:
Thanks for the update.
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