Amazon office offering
So far, it's Google Apps v Office365, and Azure v Google Cloud v AWS: Amazon haven't shown an interest in the office side, just cloud services.
It's not hard to imagine them offering some sort of e-mail service, though - they're already added static web hosting, DNS and e-mail sending facilities; putting inbound (MX), spam filtering, POP3/IMAP wouldn't be a huge departure. Trying to offer their own office suite, though? That would be a huge leap for them, and a strange direction to move in, too.