Even though Microsoft has just delivered one of its largest batches of security patches ever - including one for a critical hole in Word - hackers and researchers have found three new (and as yet unpatched) holes involving Excel. Two of the bugs permit attacks when you open a doctored Excel spreadsheet stored on a Web site or sent as an e-mail attachment. The first is clearly related to the way Excel handles memory, and could enable an attacker to take control of your PC. It hits Excel versions 2000 through 2003 for Windows, Excel 2004 and v. X for Mac (a Microsoft blog posting at http://blogs.technet.com/msrc/archive/2006/06/24/438657.aspx addresses the Excel issues).