Moving and upgrading Cyrus-imapd (howto) ?

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In connection to upgrading our small email server (around 35 users) I have run into a slight problem. I can log into my server and also get a folderlist, but it seems it is hanging (not displaying) content in the folders.

My source server is running this version:
version
name       : Cyrus IMAPD
version    : v2.2.6 2004/06/17 18:54:31
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : Linux
os-version : 2.6.11.11
environment: Built w/Cyrus SASL 2.1.18
            Running w/Cyrus SASL 2.1.18
Built w/Sleepycat Software: Berkeley DB 4.2.52: (December 3, 2003) Running w/Sleepycat Software: Berkeley DB 4.2.52: (December 3, 2003)
            Built w/OpenSSL 0.9.7b 10 Apr 2003
            Running w/OpenSSL 0.9.7b 10 Apr 2003
            CMU Sieve 2.2
            TCP Wrappers
            mmap = shared
            lock = fcntl
            nonblock = fcntl
            auth = unix
            idle = poll

Destination:
version
name       : Cyrus IMAPD
version    : v2.3.1-Invoca-RPM-2.3.1-2.6.fc5 2005/12/20 15:54:43
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : Linux
os-version : 2.6.15-1.2054_FC5
environment: Built w/Cyrus SASL 2.1.21
            Running w/Cyrus SASL 2.1.21
Built w/Sleepycat Software: Berkeley DB 4.3.29: (February 15, 2006) Running w/Sleepycat Software: Berkeley DB 4.3.29: (March 24, 2006)
            Built w/OpenSSL 0.9.8a 11 Oct 2005
            Running w/OpenSSL 0.9.8a 11 Oct 2005
            CMU Sieve 2.3
            TCP Wrappers
            mmap = shared
            lock = fcntl
            nonblock = fcntl
            idle = idled

My procedure for migrating to the new server was stopping the source server. Finding all files that were running the Berkeley format and making a new file using the cvt_cyrusdb to make a new skiplist format file. I then used rsyns to copy all the files to my new server (keeping its location in the filesystem the same). I copied the imapd.conf and the cyrus.conf over (with a few adjustments to give support to sql authentication backed). As a final step I converted the skiplist files back to the new Berkeley database format and started the server.

Anyone with any ideas what can be the problem... Or even better - what is the correct way to migrate Cyrus-Imapd from one version to another?

Thanks,
 Jesper K. Pedersen
----
Cyrus Home Page: http://asg.web.cmu.edu/cyrus
Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html

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