1&2: All 3 servers should be in the same Org. Otherwise you can't move
mailboxes and OWA couldn't query AD for locations of users, etc. Same Org
3: 2003 Standard can be a FE, so this is up to you.
4: Take a look at q316886, it is written for 2000 but applies to 2003, it
covers all but the FE piece
5: Again, same org so it should be a 2 way intra - not inter - again see
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