What does the "ms" in "mscorlib" stand for - hint: it's not "Microsoft".

There's an intriguing post on .NET 247 saying that the “ms” in “mscorlib” doesn't stand for Microsoft anymore:

out of the book 'Applied Microsoft .NET Framework Programming':
------------------------------------------------------------------------
When Microsoft first started working on the .NET Framework, MSCorLib.dll was
an acronym for Microsoft Common Object Runtime Library. Once ECMA started to
standardize the CLR and parts of the FCL, MSCorLib.dll officially became the
acronym for Multilanguage Standard Common Object Runtime Library.