Current Situation: We have Active Directory Domain setup as CompanyName.local and our Domain Name (CompanyName.com), website, and E-Mail are hosted through Network Solutions. All DNS records for CompanyName.com point to Network Solutions' Servers. We have only 50 E-Mail users, with only 3 users that have mobility requirements. I am in the process of installing Exchange Server 2010. I have installed the HUB, Client, Unified Messaging, and Mailbox roles on a single server. Is it possible to keep our Active Directory Domain as CompanyName.local, keep our E-Mail and Website hosted through Network Solutions, and setup our Exchange Server to simply download all E-Mails from our hosted accounts into corresponding Exchange Server Mailboxes that all internal clients send and receive through? Would our 3 mobility users be able to continue downloading directly from our hosted (POP3) E-Mail provider when out of the office, and then sync with the Exchange Server upon returning to the office?

Thank you for the clarification regarding domain names and UPNs...that helps clear up a lot! As for the POP3 situation, I understand that POP3 is not a transport protocol and is not designed to be used as such. I did a Google search and found that there seem to be several third-party applications or add-ons that would facilitate the scenario I had described above. I was just wondering if anyone had ever attempted anything like this, had any success or problems with it, or could recommend what the best solution is if they've had success with it. If you or anyone has had any stable success with it, I'd be interested in hearing about it. However, based on your recommendation above, unless I hear anything to the contrary, I'll pursue the Edge Transport and modifying the MX records route.

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