Office Depot Aims for Business Customers  NEW YORK (Reuters) - Retailer Office Depot Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ODP.N target=/stocks/quickinfo/fullquote"&gt;ODP.N&lt;/A&gt; is  making over its brand, appealing to small business customers  who still find it hard to distinguish its staples from those of  its biggest rival.