Advice needed: Migration Dovecot to Kolab Cyrus.

[Winfried Ritsch]

Thank you for the information.

It would be nice if you can sent me some config, since I will give it a try 
because I stuck now with imapsync, not syncing folderisch mailboxes without 
being a mailcontainer (see mail before).

mfg
 winfried



Am Donnerstag, 21. März 2013, 07:05:40 schrieb Mat Cantin:
> On 2013-03-20 1:56, Winfried Ritsch wrote:
> > Hello,
> > 
> >  I set up a new Kolab 3.0 on Debian wheezy and I am quite a newbie on
> > 
> > this.
> > (Thanks for this work, I installed it on a fresh server setup quite
> > nicely and
> > it is working quite well, with some problems, not urgent needed.) Now
> > I want
> > 
> > to switch to the new server:
> >  What tools to use for migration of maildirs from exim/dovecot to
> > 
> > Kolab 3 ?
> > 
> > Here my try:
> >  - I created same users on Kolab, adjusting the uid so login should be
> > 
> > the
> > same,
> > 
> >  I used imapsync from Fedora free source:
> > https://fedorahosted.org/imapsync/
> > 
> >  with options:
> >   --tls1 --tls2 --syncinternaldates --delete2  --noexpunge --subscribe
> >   
> >   (no --delete2folders since it would erase default folders of Kolab)
> > 
> > Since mailboxes are quite big, I did a pre-sync during running system.
> > after
> > that during switching (exim mailserver down, firewall blocked imap) I
> > did a new
> > 
> > sync:
> >   - some of mails where doubled, folder structure was broken.
> > 
> > on this new imapsync a lot of mails are copied again, which will take
> > more
> > then 8 hours, to long for a mailserver downtime.
> > 
> > So now I switched back to old sever before completing.
> > 
> > Like stated before: Has anyone a hint how it could be done more
> > smoothly ?
> > 
> > mfg
> > 
> >  Winfried Ritsch
> 
> I've quite successfully used offlineimap [http://offlineimap.org/] on 3
> sites with over a dozen users, and with a couple of mailboxes over 20GB.
> The best part was that I was able to have both the old system and new
> system accessible by the users, so they could switch back and forth if
> they wanted to. Although the initial sync does take some time, once it
> was done I had the mailboxes sync every 10 to 15 minutes so email delays
> were minimal, there was no downtime for the end user, and they were able
> to switch to the new system at their leisure.
> 
> A couple things to note: you do need the passwords for the users you're
> migrating, and the initial sync would sometimes copy a message but error
> out on message UID mismatch so it had to be re-run several times on big
> mailboxes (I just created a loop script). The default for offlineimap
> was to copy the message on error, so I didn't loose any messages, and
> the next run would start at the next message.
> 
> I can share my config file if you want, it took me a little while to
> get it right, especially figuring out how to handle converting Dovecot's
> INBOX subfolders to Cryrus' regular folder, and how to map folders with
> different names like the "Sent Items" folder to the "Sent" folder.
> 
> --
> Mat
> 
> _______________________________________________
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> Kolab-users at kolab.org
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-- 
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Winfried Ritsch
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