Problem 1 can also be seen on ADODB.Connection. It is not specific to COM, though: Interface ICollection inherits from IEnumerable. In C#, if I declare a variable as ICollection, I'll see GetEnumerator. In Python, if I cast to ICollection, I do not see GetEnumerator. I think this is because interface inheritence is a different animal than class inheritance. It seems to be more contractual than structural. I sent a workaround to Brian. The fix is probably not the best way of doing it, and is probably not complete, but it does seem to help. - I noticed as well that properties on interfaces don't work, e.g. I have to call get_Count() rather than just accessing the Count property. from CLR.System.Collections import Hashtable, ICollection ht = Hashtable() c = ICollection(ht) print c.Count #fails A fix for this is also sent to Brian. Bruce