May 3, 2016, update for Outlook 2013 (KB3115031)

Applies to: Microsoft Office 2013 Service Pack 1Outlook 2013Office Home and Student 2013 RT

This article describes update KB3115031 for Microsoft Outlook 2013, which was released on May 3, 2016. This update also applies to Office Home and Student 2013 RT. This update has a prerequisite.

Be aware that the update on the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2013. It doesn't apply to the Office 2013 Click-to-Run editions, such as Microsoft Office 365 Home. (How to determine?)

Improvements and fixes

Fixes the following issues:
  • Online archive and public folders may disappear for a profile in Outlook 2013.
  • When you respond to a recurring meeting with a single occurrence in Outlook 2013, Outlook 2013 may crash.
  • Contact entries are not sorted alphabetically in a hierarchical address book in Outlook 2013.

    Note To fix this issue, see KB3115007 for more information.
  • Assume that you have connected to an Exchange server in Outlook 2013. In this situation, you still receive a prompt that lets you connect to the server. This issue occurs if the security certificate is mismatched.

    Note To fix this issue, see KB3115008 for more information
  • When a Web Add-in adds a file as an attachment to an email message or an appointment, an incorrect file name is used.
  • When you click a button in Outlook add-ins in Outlook 2013, Outlook 2013 may crash.
  • If Outlook 2013 connects to an Exchange server by using the MAPI over HTTP transport protocol, Outlook 2013 and Skype may crash. This issue occurs after you install April 5, 2016, update for Outlook 2013 (KB3114941).

How to download and install the update

Microsoft Update

Use Microsoft Update to automatically download and install the update.

Download Center

This update is also available for manual download and installation from the Microsoft Download Center. The updates in the Download Center can't be installed on Office Home and Student 2013 RT.If you're not sure what platform (32-bit or 64-bit) you're running, see Am I running 32-bit or 64-bit Office? Additionally, see more information about how to download Microsoft support files.

Update information


To apply this update, you must have Microsoft Office 2013 Service Pack 1 installed.

Restart information

You may have to restart the computer after you install this update.

More Information

To determine whether your Office installation is Click-to-Run or MSI-based, follow these steps:
  1. Start Microsoft Outlook 2013.
  2. On the File menu, select Account.
  3. For Office 2013 Click-to-Run installations, an Update Options item is displayed. For MSI-based installations, the Update Options item isn't displayed.
Office 2013 Click-to-Run installationMSI-based Office 2013
The screenshot for Outlook Click to Run The screenshot for Outlook MSI


Learn about the standard terminology that Microsoft uses to describe software updates. The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

File Information

The global version of this update has the file attributes (or later file attributes) that are listed in the following table.