Open documents that Office wants to block

In Office 2007, if you tried to open a document created in very old versions of Office - as far back as Word 95 or Excel 4.0 or earlier - Office 2007 displayed an error message and refused to open it (Microsoft decided that old documents posed a security risk). Office 2010, fortunately, makes it easy to override those blocks. In Word or Excel, go to File, Options, Trust Center, click Trust Center Settings, then select File Block Settings, and remove the checkmarks from the older Office files that you want Office 2010 to open.