This feature refers to a very specific window of software compatibility.
As of today, Microsoft has officially ended support for Office 2011. This creates several hurdles for users trying to set up the software on a legacy system. Microsoft Office For Mac Os X Lion 10.7.5
.doc/.xls (older format) or use LibreOffice.If you're considering upgrading to a newer version of Office or OS X, here are some alternatives: Use Office 2011 for light tasks only