I have recently installed PowerPivot (v2 SQL Server 2012 x86 - 32bit) on Excel 2010 32bit and I was shocked when saw old menu style:
I must admit I prefer Excel 2010 ribbon style.... It took a while to get used to it but now looking at PowerPivot menu it just looks terrible and it is harder to use!
I investigated the issue and it seems old look & feel might be related to Window XP as this particular installation was on old PC (a few companies still use XP! generally bigger companies).
I've tried PowerPivot on Windows 7 before and they new ribbon style.
Anyone know how it looks on the least popular operating system.... Windows Vista?