An update to the Age of Empires Online support page on Xbox.com - that went live yesterday and was quickly removed - indicated that Games for Windows Live services will be discontinued on July 1, 2014. The page also revealed that Age of Empires Online would be shut down at right around the same time.
The deleted entry from the site:
"Games for Windows Live will be discontinued on July 1, 2014. Although it is available through Steam, Age of Empires Online requires features of the Games for Windows Live service. You can continue to enjoy all the features of Age of Empires Online as the service will remain 100% operational until July 1, 2014 when the server will shut down."
Last week Microsoft said that it would be shutting down the marketplace for the service, but would continue to support PC games that use GFWL. This week several publishers have indicated that they are transitioning away from the service and that future titles will not be using Games for Windows Live.
Microsoft has not publicly commented on this story.