I made the transition from PMMail to Eudora and then to Thunderbird for work. IIRC, PMMail wouldn't work with Kerberos. A few years after I moved from PMMail to Eudora, Eudora stopped being updated, so I went to Thunderbird. It also seems to be in danger of being orphaned, but it's working well at home and work so far.

If I started using IMAP it probably wouldn't be an issue, but I'm still mostly on POP and I haven't felt the need to investigate it more.

Evolution may be great, but since I've never used an integrated calendar/mail product like Outlook I haven't felt the need to try it out.

Cheers,
Scott.