false portscan alarm

I receive regulary notification from my personall firewall about port
scanning make by www.microsoft.com. This is the information from my log

2006-09-12 09:20 port scan from 207.46.18.30 TCP (1700, 1730, 1734,
1733, 1168, 1165)
2006-09-12 09:20 port scan from 207.46.18.30 TCP (2054, 2060, 2056,
2052, 2058, 2050)

Does it mean taha microsoft try to hack me ? :-)
What is the reason of that treffic ?

regards
M