Earlier quoted context omitted.
Gsuite also had inbox and Gmail and they are not free. Users who pay for those care. Next time I have to make a choice on Google product, most likely will reject it coz I can't really on them to either maintain it or give actual human support either MS is probably supporting XP in the embedded world. If you are not selling to consumers you have to be prepared to do that
Only if the administrator has allowed Inbox. Mine doesn't. Maybe most of them don't and so keeping it alive can't be justified.
* I meant the SLA for notice of deprecation not the lifetime of the product