I got this information dialog today while using Excel. I couldn’t quit the application when I tried to exit. I finally ended up cycling through and closing other open applications on my desktop before I could finally close Excel. I have never seen this before on XP/Office 2007.
I pretended for a moment that I belonged to the MS Office test team. How would I report this to a developer? Would the developer agree that this was a bug or would s/he give me grief about doing something that I wasn’t supposed to be doing? I don’t know. I have not been able to repeat this so I will just file it as a WTF sighting for now.