Exchange 2007 Topology / Design

I have a main office with Exchange 2007 where 5 users use Exchange that has a 2Mb x 2Mb internet connection.  I am adding a remote office that will have a 2 or 3 users (1 who uses both offices) and only a 8Mb x 384 Kb internet connection.  I have IPSEC VPNs between the two locations and each location has a DC that is a global catalog but am wondering what the best way to setup email access is.  As I see it I could use Outlook Anywhere, the VPN, or setup another Exchange server at the remote office.  What is the best way, why and how?  

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I'd use either OWA or OA - another Exchange server is a waste of your time and money!  

If the reduced functionality of OWA isn't an issue (when compared to Outlook using OA) *and* you don't already use OA then I'd probably go with OWA.  If you need the full functionality of Outlook or you already use OA for external access I'd use OA - except if the users will not be using Outlook in cached mode.  The latter exception is more a personal taste as I've found that Outlook can feel a little more sluggish than I'm comfortable with.  

Both OWA and OA should be secure enough to use without a VPN connection.

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