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You may experience a memory leak in Microsoft COM+ when you try to marshal user-defined types (UDTs) from one thread to another.
COM+ Interception code that is used for In-Process Marshaling caches a structure that contains type info. This cache is deleted periodically to keep the process space from growing too large. Sometimes this structure is not freed, and this behavior causes a memory leak inside COM+.
How to obtain the hotfix
This issue is fixed in the Windows 2000 Server COM+ 1.0 Hotfix Package 28. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
828748 FIX: Availability of Windows 2000 Post-Service Pack 4 COM+ 1.0 Hotfix Rollup Package 28
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section of this article.