[Dovecot] Upgrading 1.2.17 -> 2.1.x

[Adam G Tilghman]

We're planning to upgrade our site from 1.2.17 to 2.1.x within the
next few months, but we must ensure our ability to revert to 1.2.17
if problems arise.

I don't expect our maildir storage would present a problem,
but am less certain about 2.1.x index/control files remaining
readable under 1.2.17.

Should I have any reason to worry?

-- 
Adam Tilghman   Systems Support / Academic Computing & Media Services
 agt at ucsd.edu    858-822-0711     University of California, San Diego