In addition, Excel 2011 users can now install the Solver analysis tools while PowerPoint users can password-protect their presentations.
Service Pack 1 adds some minor features like the ability to author Alt Text for objects like shapes, pictures, tables, charts, SmartArt, and movies in any of Office 2011's programs. According to the download description, the update fixes critical issues and also helps to improve security, addressing 'vulnerabilities that an attacker can use to overwrite the contents of your computer's memory with malicious code.' Microsoft has announced that the first major service pack for Office for Mac 2011 is now available to the public.
