The servers of large companies do not respond to "work around".
Nope, not true on several counts:
1 - It's not a "workaround", it's a very clever solution that's based on an official Microsoft technology and an official Google technology, and yet does not compromise on privacy.
2 - This is only an issue for "some" large companies, and only a small number. It's their decision, not mine.
3 - Those companies could as easily decide to block access from *any* mobile mail app, even ActiveSync based, if it's not "Outlook" or "Nine" (or some other small "whitelist"). And then we'd be back to square one.
4 - The number of affected users is about 3-5% based on what I've seen so far.
5 - It seems to be primarily Italian companies -- is there perhaps a popular book, translated into Italian, something like "Teach yourself Exchange server administration in 21 days" which has the recommendation to block "push subscriptions" because of "security reasons"?