I got this one via email, and I've seen variants of it elsewhere:
i thought office was coming out this year, why is the name of it office 2011?
Our naming is like that of cars: if it comes out in the first half of the year, it gets that year; if it comes out in the second half of the year, it's the next year. The next version of Office:Mac is coming out for the holidays this year, so that's Office:Mac 2011.
hummmm, and now for Messenger A/V... where's the beta?
Nadyne, I would also imagine there's a very practical use for this, too, in distinguishing the Windows and Mac versions. 2010 is Windows; 2011 is Mac.
I love it when I make reference to Mac:Office 2008 and a Windows user will try to correct me: "Don't you mean Office 2007?" To that I can reply, "No, the Mac version is 2008. Do you mean to tell me you don't have the most current version of Microsoft Office?"