Hello,

I'm a system administrator for a small research group. Our group has a
lot of mail roughly 16 gigs worth for 10 users. I'm desperately trying
to get off our Exchange 5.5 server and migrate to a
FreeBSD/Postfix/Courier-IMAP mail server.

The problem is the migration part. My users collaborate with other
scientist, and they have rather large data sets they email to each
other. Not good, but it is what it is and ofcourse I have to deal with
it. Anyways, I've been trying to use imapsync to copy the mailbox over
and it seems that there's roughtly a 33 meg limit on the message size.

---
$ imapsync --host1 exchange --user1 mike --passfile1 mike.pass --host2
courier --user2 mike --passfile2 mike.pass --split1 100 --split2 100
....
Copied msg id [8155] to folder INBOX.Sent Items msg id [6592]
+ NO msg #8156 [5YgB8nPpAEu0df0lmcxXnQ:25308502] in INBOX.Sent Items
+ Copying msg #8156:25308502 to folder INBOX.Sent Items
Out of memory during "large" request for 33558528 bytes, total sbrk()
is
514009088 bytes at
/usr/local/lib/perl5/site_perl/5.8.7/Mail/IMAPClient.pm
line 1714.
---

Has anybody done this before? and Can someone point me in the right
direction on how to get this done?

Thanks,
Howard