If Google accumulated 100,000 businesses without those assurances, it business must further explode now that the software is in full compliance and therefore can get full executive approval.

I doubt that anybody is throwing out their Microsoft Office suites in favor of Google Apps, but it looks like Google is beating Microsoft in niche markets, be they email or the important growth market of application sharing. Why set up an expensive Exchange server  or a Sharepoint server to share information across departments and offices if Google Docs and Spreadsheets will let you do the same with a few mouse clicks? Setting up a shared document now is easier than putting the text into an email attachment.

Microsoft's competitive threat level just got elevated from orange to red.