I am, but I use the programs so much that it was pretty easy.  Only reason I
did it was because a couple of my clients insisted that to send any of their
employees to any of my training classes, I had to be certified.  Since it
didn't cost that much I decided to go ahead and do it.  Of course I did it
for 2002 (XP), but pretty much the same.  All I needed to do was look at the
objectives covered by the exams and prep a little.  I decided to take the
Microsoft Office Specialist Master Instructor certification so I needed
Word, Excel, PowerPoint, Access, and Outlook.  Went to a local CompUSA on a
Saturday morning and took all the exams.  They thought I was crazy for
taking more than one of them, since they are designed to last 1.5 hours or
so.  I took all five in 2.5 hours and walked away certified.

This will get you started:

http://www.microsoft.com/learning/mcp/officespecialist/requirements.mspx

http://www.certiport.com/Portal/desktopdefault.aspx?tabid=549&roleid=103&nocache
=36825

Good Luck!

Bill Foley