Microsoft Office 2013 Service Pack 1 (SP1) provides the latest updates for Office 2013. This service pack includes two kinds of fixes:
Previously unreleased fixes that are included in this service pack. In addition to general product fixes, these fixes include improvements in stability, performance, and security.
All the monthly security updates that were released through January 2014, and all the Cumulative Updates that were released through December 2013.
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Overview of Office 2013 SP1 improvements


The following are the key areas of improvement that are offered by this SP1:

Improves compatibility with Windows 8.1.

Improves compatibility with Internet Explorer 11.

Improves compatibility with modern hardware, such as high-DPI devices and the precision touchpad.

Provides new apps for Office capabilities and APIs for third-party developers.

Outlook 2013 SP1

Provides support for task pane apps in Outlook 2013 to enable third-party developers to extend the compose experience for email messages and calendar items.