This article from the Seattle Post-Intelligencer provides a look inside the Macintosh Business Unit at Microsoft.

Many of the Mac faithful are uneasy about Microsoft and its dominance. But many of them depend on the Redmond company to make Mac versions of Microsoft products -- such as Word and Excel -- that let them share documents and relate to others in a world where Windows is the dominant operating system.

Update: SP-I has posted a follow-up with some notes left over from the article. (Now I really want to visit the campus and see that collection of old Mac hardware.)

It seems strange to me that features developed for the Mac version of Office would not automatically migrate to the Windows version and vice versa, but the article seems to imply that there's no structure in place to make that happen. Weird.