I found a big problem in my company, when our user( using outlook 2010) reply or forward the e-mail, the content(include the orginial message) will disappear, when I checked in the sent item, it also nothing inside, but our customer, using another e-mail
client, such as outlook 2007 or in yahoo.com webmail, they can see the contact without any missing, I tried to use the safe mode ,also same result (disappear), but I tried to use outlook 2007, it no problem that, why happen this kind of problem in outlook
I recommend you have a test on a fresh installed computer to see if it can be reproduced.
If not, perform a clean boot on your client to determine which program could be the reason: http://support.microsoft.com/kb/929135
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