I think you're asking if both Exchange 5.5 and 2k3 can have Internet (SMTP) addresses, but I'm not sure. The answer is yes for both. You certainly don't need to upgrade to make it work, but you can if you want to. Things change a lot between versions, however, so it's not a simple project that should be taken on without forethought and planning.
Last Wiki Answer Submitted: April 12, 2006 6:03 pm by Swiftd0 pts.