We currently have Unity 4.0(5) UM connecting to a single separate Exchange 2003 server (sp1). We're having hardware faults with our exchange box and need to migrate to a new server before complete failure.
We're installing a new Exchange 2007 w/ SP1 and will be migrating all of our mailboxes there.
When we have time we want to upgrade our Unity to 5.0 and use it for unified messaging with the new exchange server, but right now it's slowing our recovery.
Can we quickly revert our current Unity setup so that it is standalone? It's OK for our users to get new messages by phone only. I assume old messages will remain in Exchange and may not be accessible by phone?
Will these actions make it harder to re-unify later?
We're a small non-profit with 50 employees, no lab and no extra hardware. This seems like the safest approach to me, but I'm far for certain. All advice welcome.