Migration Pointers?

[Jared Watkins]

Hello all...

I'm working on a migration from a single linux Iplanet (aka Netscape aka 
Sun One) messaging server with Iplanet ldap backend for the user 
database TO cyrus on linux with an active directory backend.  I have 
about 2500 accounts on this sytem.. and from the mta logs I go through 
about 100k messages and 5GB a day of mail volume usually with delivery 
peaks of no more than 300 messages a minute.  Most users get their mail 
via pop.. but we will encourage more of them to use imap along with 
sieve.  We use a wide range of client apps..  all versions of outlook.. 
outlook express.. eudora.. netscape.. mozilla.. act.. and some others. 
 (This has me most worried)   We also require the use of SSL/TLS for any 
logins from outside our lan.

I'm planning to deliver mail via lmtp from our postfix relays... letting 
them deal with virtual user/domain issues through ldap lookups...  we 
have only one namespace with the first initial last name style of 
usernames.  

I'm already well on my way to finishing some web based cyrus/AD admin 
tools.. and AD migration scripts...

Hardware wise... it will be dell on either a dual or quad xenon system.. 
with 2G of ram.. and either an 7 disk local raid array or a FC attached 
SAN.  

For the actual data migration... I have a simple plan.  Since most 
people use pop..  I'll just cut mail delivery over to the new system.. 
and provide a page on our intranet for people to move their old mail 
from one server to the other.. this way I already have their password 
since they are logged into our intranet.

Has anyone done a migration like this before?  I'm looking for some 
gotchas or left field sort of problems I may encounter...  I've  also 
read some about performance and recovery best practices.. but I'm sure 
there is more I could learn from all you fine people.  I hope to catch 
most of the problems through my testing process.. but you never really 
know what you are going to have problems with until it's in the wild of 
production.

Thanks in advance...
Jared

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