Why is MS-COM a language feature?

[Frank Benoit]

This is inspired by the question of Bill B. from the "Comparing 
interfaces does not call opEquals" thread.

Even Java can bridge to COM without language support. See SWT.
So if it is possible to connect to COM with lib functions, why have it 
directly supported by the language?

Who of this community is actually using COM? How is your experience? 
What is possible? What is not? Could it be done in a lib?

Wouldn't it make much sense to throw the COM support out of D entirely?