Re: Possible quick fix
I've used cyrus for the past 19 years now.. for email it works great(though the migration from v1 to v2 was quite painful - though I haven't run email for a corporate type environment since 2002 and at the time it was Cyrus). Since then the only email hosting I have done is just my personal and family stuff.
I don't have opinions strong enough to try to talk someone else into what email solution to use, but I wanted to (sadly) mention this that I noticed last year:
made me kinda feel sick inside (the main reason of course being they built Cyrus, am not sure how much involvement they have in it today).
I have been a user of office 365 for the past 6 years or so(I don't work in corporate IT so have never managed exchange). I don't have major complaints. I'm certainly not the office power user who leverages their stuff more so can understand those who need that groupware functionality. I could get by with just IMAP without an issue though I know many others need much more than that. Office 2010 on windows 7 and OWA on Linux and email on android all seem to work ok.