I'm planning on moving from a single 2003 Exchange Server Standard (running
on a Win2000 server with SP4) to a 2003 Enterprise setup on multiple servers.
I plan to have 3 servers: 1 as the front end server running Windows Svr 2003
Ent & Exchange 2003 Ent.  The other two servers will be setup as an
active/passive backend server cluster, both running Win Svr 2003 Ent &
Exchange 2003 Ent.

I've been reading docs from Microsoft about implementing the
frontend/backend topology as well as the high availability docs dealing with
clustering.  I'll be purchasing two new servers that will serve as the
backend cluster.  I want to use the current exchange server as my new
frontend server.  I'm assuming that I'll have to move the current mailboxes
to a temporary server so I can reload and reconfigure the current exchange
server as a front end server.

I should also include that there are approximately 200 users that will
access the servers.  We also use our exchange server to hold our voicemails
from our Cisco IP phone system.  

Does anyone have any advice on how I should prepare for the move?  What
about the actual move?  Did anyone experience any problems that can be
avoided?  I would appreciate any advice out there.  Thanks!

Nick