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Using Exchange 2010 mailboxes on 2 Trusted Forest

Last Modified: 2012-05-09
My organisation has 2 separate Active Directory Forest in 2 different geographical sites, ABC.com and DEF.com. Both have 2 way trust established.
An user A is currently in ABC.com but will be relocating to DEF.com. He will be spending 50% of his time at both sites. However, he wants to maintain his email account in ABC.com such that he can send and receive on DEF.com.

My plan is to create Forwarding on Exchange Server on userA@ABC.com to userA@DEF.com.
Thus all his incoming emails will be forwarded out to userA@DEF.com.
When he is in DEF.com site, he will connect to userA@DEF.com and SendAs userA@ABC.com.

Just 2 issues I have problem with-

1. Can I setup Outlook 2010 on DEF.com to SendAs default userA@ABC.com when he is in DEF.com domain? I want him to be able to send using userA@ABC.com without having to switch the From: every time he sends email.

2. How do I route his sent items such that he when he sends out from DEF.com as userA.ABC.com --> A copy is kept on userA@ABC.com in his Sent Items?
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