Other people have commented on stability issues with Word 2007. I haven’t seen any of those. But I have noticed issues with Outlook 2007.
I probably spend equal time viewing my email on my main desktop (which is now Windows 7 Beta) and my Samsung Epix, which allowed me to find this issue. There are times (maybe once every day or two) when Outlook 2007 stops being able to download email from my various sources. Usually, it will give a send and receive error, but at least once, it didn’t indicate any errors, yet wouldn’t download any new email (which I knew I had from my phone). Shutting down Outlook and restarting it always fixed the problem, but this obviously is an issue.