"Support" meaning you can depend on it being there and being updated. Windows is well supported. Exchange is well supported. Office is well supported. There's a not insignificant list of well supported products.
I think you have just listed most of them.
Microsoft has gained a well deserved reputation for dropping products on a whim. Companies (customers) have invested time and money in these, only to be f#ck#d over. Not every company is large enough to rewrite systems every time MS change their mind/management. Just look at Silverlight and LightSwitch as a couple of more recent examples. They they are wondering why they are losing market share, quite simple, no one in the industry trusts them any more.
BTW, who in MS thought it would be a good idea to redefine CSV as Character Separated Value, then decided the default character would be different in different countries so should be buried down in Regional Settings? WTF were they thinking?
My current problem is a bug in Windows 1703 breaking a report writer. The fix is to delete an update. But these computers are running Pro, so are set not to load updates as they come out. So they are now loading the full 1703 Windows update, which contains the unfixed bug.....