Microsoft's Cut-Down Windows Set for More Markets  SINGAPORE (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; said on  Thursday it will begin shipping a low-cost version of its  Windows XP operating system to three Asian countries and Russia  within weeks, tapping developing markets as growth slows  elsewhere.