On Tue, Nov 16, 2010 at 08:41:46PM +0530, Shuvam Misra wrote: > > > I think the issue you will encounter first is clients will start to fall > > > down when folders exceed a 'reasonable' number of messages. Common IMAP > > > clients I've seen start to exhibit severe performance issues beyond a > > > few hundred thousand messages. > > > > As far as I'm aware (the helpdesk guys know better than me so I'm parroting > > their reply), Outlook 2003's PST file has a limit of 2GB so if it's locally > > caching folders, you may run into that. > > > > If you use Outlook 2007 or later, the limit is more like 20GB. BUT, if you > > upgrade from 2003 and use the same PST, that PST may continue with the same > > 2GB limit. Apparently you might need to create a new PST file and move the > > mail into it?. Some big users have been moved to Thunderbird to avoid this > > and to improve performance. > > > > Gavin > > > > ? To be honest, I haven't personally dealt with this issue, but this > > paraphrases the knowledge of those here who have. I'd think of it as > > having "[citation required]" beside it. > > I'm in an almost-identical position w.r.t. lack of direct knowledge, but > our Support guys say exactly the same things about Outlook 2003 and > Outlook 2007 and size limits of PST files. > > That said, we have users of our product who have 40GB mailboxes. > Cyrus works perfectly happily with all this. The problem is the number > of messages in the current folder, as many have mentioned before me. We > keep telling users to clean up their Inboxes and keep a max of 1,000 > msgs there. We know things will be fine with 10,000 messages too, but > 100,000 msgs in a folder is pushing things. > > We find that Webmail chokes server performance much earlier than normal > IMAP clients do. I know this has nothing to do with Cyrus, but I just > thought I'd mention it. Most programming environments in which such > Webmail thingies are written (mostly PHP on the server and nowadays > lots of Javascript on the browser) cannot keep an IMAP connection to the > Cyrus server open between pages, therefore each time a user clicks on a > folder or does any other operation, there's this fresh IMAP connection > and a huge surge of IMAP operations while the folder contents are listed > afresh, etc. This puts a lot of load on the server. I guess Webmail is > OT on a Cyrus mailing list, but can't help asking: any suggestions for > improving Webmail performance? (Admission: we haven't yet tried imapproxy > -- it appears to be a good piece of C which will help things.) > > regards, > Shuvam We use imapproxy here to avoid exactly this situation with webmail. Cheers, Ken ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
