Support for task pane and content apps in Outlook and PowerPoint via new APIs.

Enhanced support for Windows 8.1 and Internet Explorer 11.

, specifically including updates through February 2018, represents a critical stability baseline for this version of the suite. Summary of Service Pack 1 (KB2817430)

By February 2018, Office 2013 was in its phase. Updates during this period focused almost exclusively on security vulnerabilities and critical bug fixes.