Outlook Slow After Migrating to Exchange 2013

, Outlook Slow After Migrating to Exchange 2013

If you’ve just migrated your mailbox to Exchange 2013 and you’re having issues with slowness in Outlook (opening Outlook, reading e-mails, etc.) you may need to adjust something called TcpAckFrequency in the registry.

The default TcpAckFrequency parameter in Windows is 200ms, which does not always work well with Exchange 2013.

Luckily, there is a very simple fix.  Change the timeout setting in the registry as follows:

  • Start Registry Editor (Regedit.exe).
  • Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
    the interfaces will be listed underneath by automatically generated GUIDs like {0739C22F-850B-BC97-76B3-2F0A99162D13}
  • Click each of the interface GUIDs (there may be more than one) and perform the following:
    On the Edit menu, point to New, and then click DWORD value.
    Name the new value TcpAckFrequency, and assign it a value of 1.
  • Close the Registry Editor.

Restart Windows for this change to take effect

This should fix your performance issue immediately.

Did you find this helpful?

Share it on social media!

Todd received his MBA from Villanova University and his B.S. in Electrical Engineering from Penn State. Prior to joining Adaptive Solutions as Director of Datacenter Operations in January 2008, Todd worked for his own consulting firm for the last ten years providing technical expertise for a variety of large and mid-sized corporate clients including General Motors (Saturn Division) in Delaware. Todd assumed the role of Chief Technology Officer in December of 2012. In his current role with Adaptive Solutions, Todd helps to set best practices and technology standards for the company. Todd also has a wide range of expertise, including VDI, virtualization, and numerous Microsoft technologies, as well as document management. Todd maintains numerous Microsoft Engineer certifications and is considered an expert in the field of server and desktop virtualization.

Leave a Comment