Cached Exchange Mode may improve the performance of Outlook on some Internet connections. Cached Exchange Mode creates a local copy of the data stored on the Exchange Server. Outlook accesses this cached copy for most operations, speeding response times. Outlook and the Exchange Server synchronize the local and server data periodically.

To enable Cached Exchange Mode, follow the steps below for your version of Outlook:

For system recommendations for using Cached Exchange Mode, see the section Outlook Cached Mode Recommendations below.

You can find more information on Cached Exchange Mode in the Microsoft Knowledge Base.

In Outlook 2010/2013:

  1. In Outlook, go to the File > Account Settings, then click on Account Settings again in the dropdown.
  2. In the Email tab, select your Exchange account and click on Change.
  3. In the Exchange Server Settings window, check Use Cached Exchange Mode and click on Next.
  4. You should be back at the Email Accounts window. Click on Finish.

You should see a notification window that advises you to restart Outlook in order for the change to take effect:



When you re-launch Outlook, it will begin to make a copy of your Mailbox content to your computer. This will take some time. Not all items will be immediately available. If you have a large mailbox or a slow Internet connection, it can take an hour or more.

In Outlook 2007:

 

  1. In Outlook, go to Tools > Account Settings.
  2. In the Email tab, select Microsoft Exchange Server and click on Change.
  3. In the Exchange Server Settings window, check Use Cached Exchange Mode and click on Next.
  4. You should be back at the Email Accounts window. Click on Finish.

You should see a notification window that advises you to restart Outlook in order for the change to take effect.



When you re-launch Outlook, it will begin to make a copy of your Mailbox contents onto your local computer. This will take some time. Not all items will be immediately available. If you have a large mailbox or a slow Internet connection, this can take an hour or more.

 

Outlook 2007 Cached Mode Recommendations (Client PC):

Mailbox Size                             Memory Size                           Hard Disk Speed

1 GB                                            1 GB                                   5400RPM
2 GB                                            1-2 GB                                7200RPM
> 2GB Reduce mailbox size, or use online mode.

Your mileage may vary due to your specific hardware and performance threshold.