Sent Date is not showing up when Forward / Reply on OWA   

I am sending mails using webdav, but when someone (whose mailbox is on a 
different exchange server within the domain) uses OWA to reply or forward the 
mail , the "Sent Date" is not populated in the original mails content.  The 
date is populated on the list page, but not in the forwarded mail.  To make 
things stranger....If the users' mailbox is on the same exchange server as 
the person who origianlly sent the mail, then the date is populated fine.

I am using the following javascript code to create the message text

strNewLine = String.fromCharCode(13) + String.fromCharCode(10)

dteCurrentDate = '5/3/2006 15:6:25'

strMsgText =	'content-class: urn:content-classes:message' + strNewLine +
		'MIME-Version: 1.0' + strNewLine +
		'X-Mailer: mail_compose.asp' + strNewLine +
		'Content-Type: text/plain;' + strNewLine +
		'Content-Transfer-Encoding: binary' + strNewLine +
		'From: ' + mstrViewUPN + strNewLine +
		'To: ' + strTo + strNewLine +
		'Cc: ' + strCc + strNewLine +
		'Subject: ' + strSubject + strNewLine +
		'Date: ' + strDate + strNewLine +
		 strNewLine +
		 strBody

date: Wed, 3 May 2006 13:10:02 -0700   author:   KHoge44