As you may be aware we are attempting this and have run into various problems. Currently we have a mixed murder of 2.3.15 backends and 2.4.17 backends. We are now fairly confident that we can xfer accounts succesfully between these backends. The problems we had appear to have been with a very small number of accounts on our older backends that had corrupt cyrus.index files. However we are now having trouble configuring frontends that will work with this mixed murder environment while we xfer our users accross. If we use our existing 2.3.15 frontends then users have who have been migrated lose the ability to see other accounts in the "Other Users" name space. On the other hand if we introduce 2.4.17 frontends then we see strange behaviour around folder creation. Clients can create the folders but autosubscription fails with the client being told the new folder doesn't exist. If one waits a minute or two one can manually subscribe to the folder. So far we have not upgraded the mupdate master. Is this a mistake? In terms of the frontend config we have added suppress_capabilities: ESEARCH QRESYNC WITHIN XLIST LIST-EXTENDED to the 2.4.17 frontends, otherwise the config is identical to our 2.3.15 frontends. Is there any other config changes we should be aware of? any ideas greatly appreciated... Gavin Gray Edinburgh University Information Services Rm 2013 JCMB Kings Buildings Edinburgh EH9 3JZ UK tel +44 (0)131 650 5987 email gavin.gray@xxxxxxxx -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus