Unfortunately, I also do not have this information :(.
Personally, I do not think that Microsoft is going to stop supporting COM / COM + in the near future (just take a look at the # o components, each version of Windows represents / depends on). To be sincere, I do not believe that they can afford to stop supporting COM +, ever.
IMHO, the more important question is how easy / expansive it is to find qualified developers to support the code base.
Hope this helps
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