@adfichter Between Outlook 365 requiring email copies sent to MS servers and the Windows Recall misfeature, the MS stack now looks like a platform for spying on the plebes.
Assuming MS can assure institutions that any "cloud" involved in the spying will stay in the jurisdiction, then they may find it an attractive proposition.
There is also the issue that Russian hackers gain entry to MS systems and conduct major heists on a semi-regular basis. Choosing the platform that will be most vulnerable to Russian hacking should raise additional questions.