Microsoft, Others File More Anti-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; and other  Internet access providers filed three new lawsuits on Thursday  to stop the spread of unsolicited e-mail messages touting  everything from home refinancing to miracle health cures.