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New Microsoft cert extension?

Found an extension with this OID in a Win2K cert: 1.3.6.1.4.1.311.21.1. 
Here's what it looks like from Peter Gutmann's dumpasn1:

 576 30   16:         SEQUENCE {
 578 06    9:           OBJECT IDENTIFIER '1 3 6 1 4 1 311 21 1'
 589 04    3:           OCTET STRING, encapsulates {
 591 02    1:               INTEGER 0
            :               }
            :           }

I believe that 1.3.6.1.4.1.311 belongs to Microsoft, but does anyone
know what this extension is?

		Marc