December 8, 2015, update for Outlook 2010 (KB3114409)

Applies to: Microsoft Office 2010 Service Pack 2Microsoft Outlook 2010

After you install this update, Outlook 2010 may start only in safe mode. If this issue occurs, uninstall the update. A new version that contains the fix for this issue as well as the fixes listed below is available from KB3114560.


This article describes update KB3114409 for Microsoft Outlook 2010, which was released on December 8, 2015. This update has a prerequisite.

Improvements and fixes

  • Adds administrative support to prevent Outlook 2010 from booting into safe mode. Administrators set this function in some scenarios when they have add-ins that must be enabled.

    Note To enable this function, see How to use the Windows registry to prevent Outlook 2010 from starting in safe mode after it crashes.
  • Fixes the following issues:
    • Assume that an email message is sent programmatically in Outlook 2010. When you try to send another email message to the same recipients, you don't get any suggestion for the recipient names. This issue occurs because the recipients aren't added to the nickname cache.

      Note To fix this issue, see No suggestion for recipient names when you try to send email messages to same recipients in Outlook 2010.
    • If an appointment or a meeting length is less than 24 hours but it spans across midnight, it's displayed as two appointments or two meetings in the month view in Outlook 2010.
    • You experience repeated reconnect attempts because the X-PendingPeriod response header isn't respected for the MAPI over HTTP transport protocol.
    • Consider the following scenario:
      • An email message has multiple attachments.
      • The file names of the attachments contain characters other than US-ASCII.
      • The order of the files is sorted by Unicode that differs from the order by the current system locale (such as Japanese and Russian).
      In this situation, the file names may be overwritten by another file name or swapped.

Update information

Restart information

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


To apply this update, you must have Microsoft Office 2010 Service Pack 2 installed.

Note You may also need to apply Language Pack Service Pack 2 for any Language Packs you previously installed.


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. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.