I haven't been looking into the migration tool, but I'd like to say that one of the real possibilities of gaining a high number of deployments is reaching out to all us sorry exchange 5.5 users...
I'm one of the (many?) holding on to 5.5 for the right open source solution to come along.
Making sure there's an easy migration path from 5.5 to zmbra is what I'm looking out for these days!
:water |