Well, truth be said, Google Apps for Business also offers similar benefits, but it uses ActiveSync, which does not allow you simple syncing with Outlook 2010/2013 and your Nokia N9.
Nokia N9, like many other smartphones, does support ActiveSync, but for reasons unknown to me, tasks and contacts do not always get synced correctly. Outlook 2010, you might say, supports Google Apps - but only if you use additional software like Google Calendar Sync (for free version of Apps) or more advanced Google Apps Sync if you use Google Apps for Business.
Office 2013 with Outlook 2013 offers support for ActiveSync, but only for Hotmail account (strangely enough, duh). Any attempt to set-up Google accounts will end in failure. I'm just wondering whether it is Google's or Microsoft's failure, but according to several sources the shortcoming will be fixed with the coming of retail version of Office 2013, and is reportedly due to ActiveSync version incompatibility.
Microsoft Mail for Exchange (in Office 365) is the only way to get your Nokia N9 synced properly with outlook, without any add-on software like Google Calendar Sync or Google Apps Sync.