In this article about a recent change to Small Business Server ship date, an un-named Microsoft spokesperson is caught revealing some usually internal-only Microspeak:
"This routine check of the initial software on the manufacturing line found that it contained portions of code deemed "non-final," according to Microsoft."
Microspeak is one of the things a new employee at Microsoft must master. There is even an intranet glossary to help folks. I am surprised if this is genuine, and suspicious 'cause only two words from this "source" are quoted for this part of the article.
In any case, calling the code non-final is certainly sub-optimal :-)