Is SQL Server 2008 R2 RTM EOL?

Hi,

I checked on http://support.microsoft.com/lifecycle/search/default.aspx?sort=PN&alpha=SQL+Server+2008+R2&Filter=FilterNO

But, it is unclear if SQL Server 2008 R2 RTM is EOL. Is it really RTM? If yes, can some one please point me to a good document stating so?

Further, what is the difference between RTM and Datacenter, Developer, Enterprise, Express,Express with Advanced Servicesversions?

Thanks,

M.

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