Hello ed,
It does not matter if you use standard or enterprise edition for a DC itself,
but you have some roles/features not available or complete, see here about
the details, especially for CA:
http://www.microsoft.com/windowsserver2008/en/us/r2-compare-roles.aspx
http://www.microsoft.com/windowsserver2008/en/us/r2-differentiated-features.aspx
For clustering you have at least to use the enterprise or datacenter edition.
And for RADIUS i did not know about changes.
Best regards
Meinolf Weber
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