Indeed - this is why you can't really compare your experience with the once I posted. He may well have been using rubbish hardware - but even if he wasn't, the case remains this shows a vast improvement from cyrus over courier using the same hardware.
I can! My mail server is a piece of crap! :) (Athlon t-bird, 1ghz, 512mb RAM, 60gb 7200rpm IDE disk)
I'm using courier on it, and the box was seeing 3000-5000 messages a day (mostly spam, thanks to a user that insisted on using wildcard email addresses.. bleah) and was doing ok. I have several folders that each have over 10,000 messages and the respond just fine with courier.
Squirrelmail can get through them ok too. the turck-mmcache (e-accelerator now) helped out quite a bit.
Overall, I'd say that it depends on your situation and mail volume. I have been very happy with courier. It's been stable and has never given me any trouble.
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