Outlook for iOS/Android App Availability for Government

There is a reason for the confusion around this.  Some already touched on in this thread.  MS does not have consistent messaging nor consistent behavior. 

The service description states the app is not supported.  It does not say it can't work, just not supported.  That also means of course it has not been certified to meet the various compliance requirements of the services and applications running from the GCC.  My assumption here is that is because of the Azure piece, that most likely only runs from the commercial Azure datacenters.  

The FAQ for Outlook app ( https://technet.microsoft.com/en-us/library/mt465746(v=exchg.150).aspx ) - there is an entry on using with Government Subscriptions, near the top of the list in fact.  The only limitation states that accounts you add to it must be in the same region. Which is odd - since GCC datacenters are only in the US (as far as I'm aware).

Behavior seems to be inconsistent.  I can confirm that in some cases Government Subscription users can use the Outlook app with no issues.  I know of multiple instances where it's used with no problems.  But I've seen various reports like this thread where some users can't use it at all.  Where it does work, you have to keep in mind the official position as stated in the service description.