Stocks Seen Weak on Oil Prices, Microsoft  NEW YORK (Reuters) - U.S. stock futures were lower on  Friday, indicating a weak market open, as climbing oil prices  and a disappointing revenue outlook from software powerhouse  Microsoft Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MSFT.O target=/stocks/quickinfo/fullquote"&gt;MSFT.O&lt;/A&gt; weighed on Wall Street.