Microsoft Revises Anti-Spam Standard  WASHINGTON (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; on Monday  said it had revised its proposal to weed out "spam" e-mail to  win over skeptical Internet engineers who have been reluctant  to adopt technology owned by the dominant software company.