My colleague James O'Neill beat me to this one. SP1 for Office is finally here, and none the sooner as I was ready to destroy my laptop and beat it with a sledgehammer because of the stability issues with Outlook.
Funny story, a lot of the bad rap that Vista has been getting has actually been due to poor performance with Office 2007, specifically Outlook 2007. This is not to say that Vista is perfect, but I just like to give credit where credit is due.
download it SP1 (KB 936982)