OK, so from what I've read, "VOS" was the older name for CTS (Common Type System), not the name of the whole project. The project was named COM+, COM Object Runtime, and Project Lightning at different times. "Ext-VOS" ("extensions to VOS") is a document that primarily proposes generics, which were only added in C# 2.0.
Now those blog posts are kind of gone from their original hosts.
F# HOPL paper,
https://fsharp.org/history/hopl-final/hopl-fsharp.pdf
Original blog post on way back machine, including the link to "MSR White Paper: Proposed Extensions to COM+ VOS (Draft)" paper.
https://web.archive.org/web/20190111203733/https://blogs.msd...