The transition was quick, and also (so far) seemingly painless.
The server is an old Pentium II 233 machine that sits between my home
LAN and the internet, and have sitting there, and running night and day
since 1999. For the first two years it was running SuSE linux, but
since 2001 it has been
Rock on. I agree, dovecot is very good. I like the integration of imap server,
managesieve, and sieve-aware LDA all in one package. Configuration is
straightforward, and since I set it up a few months ago it's been working
reliably without a thought from me.