re: Google Vs. Microsoft: Choosing Cloud Apps For Schools
The Office 365 for EDU offering is relatively new and the EDU offerings were only recently made free.
Looking at cost, it's crazy to keep Outlook on the desktop. We live our entire lives on the Web with no need for desktop clients. As I understand it Office still must be purchased. Strike two.
The Google Apps platform has been around since 2006, it's simply more mature and more functional that its Microsoft counterpart. 7 of the 8 Ivy League schools are on Apps; if that's not justification enough I don't know what is.
Regarding "previous investments in technology", those are sunk costs; the decision should be made with today's reality in mind.