A platform is a crucial element in software development. A platform might be simply defined as 'a place to launch software.' It can include a framework or operating system. Read more about the following platforms mentioned in TechNet Wiki.
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I think if we can consider .NET a platform, why not Active Directory?
@Tony Petito - Agreed.
Glenn Gailey [MSFT] edited Revision 27. Comment: per marketing guidelines, we can't just say ".NET" so I made this ".NET Framework" since both links are that.
Ed Price - MSFT edited Revision 32. Comment: Deleting one article from the Windows Phone section that doesn't clearly relate (seems more general to AD RMS).
Santhosh Sivarajan- edited Revision 39. Comment: Included Active Directory Upgrade - High Level Steps link