I am experimenting with Outlook for an email client at work. Hithertofore, I have resisted this, but due to shared calendaring it seems prudent to switch. I have always avoided Outlook up until this point for the following reasons.
- pst files are propietary, and I like open formats
- searching was far too slow, and didn't have many options, unlike mutt + grepmail
- can't archive / prune email as easily as I can with mutt and some cron jobs
- prefer fetchmail/procmail/spamassassin stack on linux for sorting and processing
- email virus issues
