User gets copied on message reply's

OVERVIEW
Desktop, Win 7 Pro SP1, Office 2013 (Outlook 2013), Running O365 for Email

PROBLEM
When the user replies to an email, "sometimes" he is getting copied on it without his name being in the "To Field"

ACTIONS SO FAR
Tried to duplicate the problem... no go

COMMENTS
This was a migration from an on premise exchange server (the server is still running even though we are not using it).

Thoughts?
LVL 3
tech911Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
I would be checking to make sure that the profile does not have any rules and also check your Transport rules as well to ensure that nothing is creating a CC for this particular user.

Also is this user a delegate for any other users that may be part of the email? Does this only happen to specific users or all? Have you tried New Outlook profile and also Windows Profile as well?

Will.
tech911Author Commented:
Good thoughts...

No rules.
Transport is out at O365 so it is standard.
This is the only user it happens to.
Outlook profile... have not "Blown it out" and recreated it... yet

I am thinking it has something to do with the global address book or maybe the old exchange server... again right now, I can't duplicate it yet...

Anybody else seen this?
Vasil Michev (MVP)Commented:
Check forwardingaddress and forwardingsmtpaddress, and check the Calendar processing settings if the issue happens only with meeting requests. Most importantly, get them to repro it then check the headers, and do a message trace. On the on-prem object, targetaddress can have similar behavior, but you need to know which address to look for.
tech911Author Commented:
It is not a cal processing issue.

If you were to send this user a message, and he was to forward it to someone in his organization,
He gets a copy of the sent message in his inbox AND it shows up as a send message in his sent items.
His email address does not appear in the "TO" part of the header, very strange.
Have opened a case with Microsoft, will post solution once I have it.

Very weird...

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tech911Author Commented:
The answer came after working with the Microsoft team and they could duplicate the behavior and we figured it out.
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