Exchange user LDAP info in reply to field

I have a  user that is having difficulty getting replies to his emails to some Apple Mail users.

When his mail arrives and is replied to, it looks like this:

==================
From: AppleMail User [mailto:email@address.net]
Sent: Monday, September 26, 2011 1:48 PM
To: =?WINDOWS-1252?Q?=22O=92LastnameofExchange User; Exchange User Full name
==================

Pretty weird. Not sure why this LDAP (?) info is ending up in the reply to field. It's not consistent and so is very difficult to track down. I have seen this with him sending to me (using Apple Mail) but not recently.

When one replies like this, the mail arrives, but another email bounces since Apple Mail thinks there are two reply to addresses.

It's kind of a hard one to track down and delicate because the people he's sending to are on the board of directors of the organization, so we want all of our correspondence with board members to look clean and professional, and not be bouncing plus I don't want to bug them about it unless it's really necessary.

Some googling of part of this reply string (To: =?WINDOWS-1252?Q?=) seems to bring up problems with special characters in subject lines.
sfmike64Asked:
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Hypercat (Deb)Commented:
Does his email address have a special character - like a period or dash or something - in it? The format of the To line does seem to indicate some sort of character that the Apple OS isn't able to interpret, and it seems that that character is in the first part of the email address.
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sfmike64Author Commented:
As a matter of fact, it does. In the AD Users and Computers, his name is O'name, so I removed the apostrophe. I think that might be it.
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Hypercat (Deb)Commented:
Sounds like it just might - post back with the results, please.
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sfmike64Author Commented:
Thanks. I've emailed the user and told him that I've removed the ' from his AD information. Will let you know what happens.
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