I don't need extensions with Kontact, it's built-in. Also I still use Akregator and the organizer/calendaring.

What I'll probably do is to switch my damn email over to IMAP at some point, apparently that's what the kdepim devs are all using... but I don't want to have to fix all my filters, and then I would have to use fetchmail and run dovecot or similar to have my email on my own computer.