Microsoft Files Seven New Spam Lawsuits  SEATTLE (Reuters) - Microsoft Corp. &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=MSFT.O qtype=sym infotype=info qcat=news"&gt;MSFT.O&lt;/A&gt; filed seven  lawsuits against senders of spam, or unsolicited e-mail, for  transmitting messages without labeling them as sexually  explicit content, the world's largest software maker said on  Thursday.