I'm not sure if anybody faced the same problem with me.
I am using windows live mail as email client for including hotmail account.
I got a problem. the system seems transfered my contacts (address book) to mail server. and my emaill account sent out junk emails with every email addresses. It looks similar with that nimda worm did before.
other info,
1, I used 3 types of antivirus software checked my system, and nothing strange.
2, I didn't manually transfer or save my email address book on hotmail server. I'm not sure "windows live mail" will auto synchnize them.
3. I checked that sending and receiving time of those junk email. my computer was not started within that period.
4. I logged in hotmail from web using another computer. the junk copys stay in sent folder.
the windows live mail seems communicated with hotmail server so closely.