Why don't you ask Wilfred Mworia if MSFT has some policy regarding users of hotmail email addresses using them to do illegal stuff. I believe defamation is applicable here? He is somewhere on this list.

On Mon, May 25, 2009 at 2:01 PM, Athar Ahmad Bhatti <atharab@gmail.com> wrote:
Hi

Unfortunately someone is spreading false roumors about a friend. The
ip lands squarley at microsoft eu as the user is using a hotmail
address.

The private addresses being used are reserved by IANA

10.224.46.8
10.204.52.82

Any ideas ??

Thanks

Athar