Microsoft AntiVirus market share

According to NPD Group report the antivirus market share in Q4 of 2006 was as follows:

Symantec 64.7% (down from 76% in Q4 2005)
McAfee 13% (down from 14.4%)
Microsoft 4.4% (just six months after release)
CA 3.6%
TrendMicro 0.6%