Microsoft posted fix for sent time in KB 2450078: The sent time in an email message body is incorrect when you reply or forward the email message by using an EWS application in an Exchange Server 2007 environment
This applies to both Entourage 2008 EWS v13 and Outlook for Mac 2011 in a Microsoft Exchange Server 2007 environment.
To resolve this issue, install the following update rollup: Rollup 3 for Exchange Server 2007 Service Pack . . .
Continue Reading: Fix: Sent time in replies or forwards for Exchange 2007 users