[Samba] NT4 PDC w/Exchange 5.5 migration

[Chris Smith]

Hello,

I'm working on migrating an NT4 PDC to a Samba 3 PDC. The tricky part,
is that the NT4 server is also running Exchange 5.5 which needs to
remain running. So unlike a migrate and toss the NT4 system, I need to
migrate, then demote the NT4 PDC to an NT4 Server, then (probably)
rejoin the domain as Exchange Server will not run on a non-domain
member system.

Basically looking for any caveats, tips or hints from anyone who has
wrestled (or thought about wrestling) with this.

Thanks,

Chris