Microsoft still has a problem. AD, Exchange, and Office (no SharePoint is not everywhere) only work on completely Windows networks. Once somebody has to use mobile computers, you are better with Samba, IMAP, and a LibreOffice compatible package.
Every mobile platform that matters hooks into Exchange - iOS, Android, Mac OS X Mail, Surface Mail, Windows Phone, Pre-Windows Nokia, all speak ActiveSync for mail, calendar and contacts. Blackberries hook in with Blackberry Enterprise Server.
And most if not all of them have some kind of Office Document viewer and basic levels of editor, either built in, shipped with, or available as an app.
And how is Samba, a clone of Windows SMB file shares, going to help anything mobile?