Airbus Withdraws Microsoft Backing-Source  BRUSSELS (Reuters) - Airbus &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=EAD.PA target=/stocks/quickinfo/fullquote"&gt;EAD.PA&lt;/A&gt; has withdrawn a filing  which gave support for Microsoft &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MSFT.O target=/stocks/quickinfo/fullquote"&gt;MSFT.O&lt;/A&gt; in an antitrust case  before the European Union's Court of First Instance, a source  close to the situation said on Friday.