I like Office 2007, and even though the early betas were very shaky, it is now fairly reliable. The one exception was Outlook 2007, which I used all throught the beta day to day without too many issues (except for it being really slow and heavy at times).
Unfortunately, I've been far less lucky since Office 2007 was released and I installed it on Vista. For some reason I still haven't figured out, Outlook 2007 crashes on me regularly while trying to compose an email (either new or a response to another email). It does not seem to matter if the email is rich text, HTML or text, for that matter.
For example, today it has already crashed three times. Anyone has any ideas as to what may be causing this?