Just for the record.
I’m working with a company that made headlines in 2012 with the announcement that it will be moving close to a hundred thousand employees to Google Apps.
Guess what format they send stuff to me in now.
Pure MS-Word and MS-Excel.
It’s not even in .docx or .xlsx but in the classical .doc or .xls formats which Google Apps no longer supports.
I suppose that even as they moved to Google Apps, they kept MS-Office around to communicate with the outside world.