Microsoft Office 2011 for Mac Service Pack 1 is a free update to the popular Microsoft Office Suite. The software solves a range of security issues that Microsoft found in for Mac Office for Mac 2011.
The original suite contains vulnerabilities that malicious users could exploit to attack your Mac. Microsoft Office Service Pack 1 patches these vulnerabilities and is therefore an essential update if you want to be safe rather than sorry.
If you use Microsoft Office 2011 for Mac, then this official service pack is a must.