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We're about 70 users using ONLY Kerio Webmail, and they're tired of his slow performance.
(Server: PowerMac G5 2x1.8Ghz 2.096 Ram 2 x 250Gb HD)
(Clients: Imac G3 80%+ Imac G4 20%)
(Both with Mac OS X 10.3.8)

We're looking to install Entourage on every computer but we want to know before if IMAP performance is enough good (with 70 users).

I suppose the ranking would be:

Webmail (the slowest)
IMAP (-)
POP and working on PST files (The fastest)

If IMAP performance isn't enough good, I think we should go to POP configuration.

Tell me about your experiences.

We prefer avoid client software to mantain easy configurations , but if we won't have chance...


P.D. : Simple Webmail on 6.1 beta 5 look great and fast, but we don't know when they will release it (our users start to get nervous with performance). Anyone knows something about it?

[Updated on: Mon, 06 June 2005 00:05]


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I have been told that 6.1 will be out by beginning of July.

(However originally they told me it would be last year so I too wouldn't rely on this info.)

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I would say the performance problem probably has something mainly to do with the relatively slow client computers (especially the G3's). Additionally, OS X doesn't make an especially high-thoroughput server environment. Don't get me wrong, I love OS X, and it's my favorite environment, but it's crap for thoroughput performance.

You might consider testing KMS on a Linux or Windows server and see if there's much improvement. We run 2,000 users using IMAP on a dual P4 2.8ghz Windows 2003 system and I would say we could probably safely double that before I'd get worried about server resources.

Kerio MailServer 6.7.1 w/AD
Windows Server 2003 SP 1
Dell PowerEdge 2850 (Dual Xeon 3.2ghz and 2 GB RAM)
~1300 users
~1000+ concurrent IMAPS connections
iPhone users
Outlook 2007 KOFF users
Apple iCal 10.5/10.6 users
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