MS Office is a suite comprising the applications, servers, and services developed for Windows and Mac OS by the renowned brand of Microsoft. Office.com/setup 2011 on Mac is a version of Microsoft Office productivity suite, initially for Mac OS X. It is the successor to Microsoft Office 2008 for Mac. One-time purchase of Office setup 2011 for Mac allows you to install office only on one computer. if you face any issue to download & install office setup 2011 visit office.com/setup to get help.