

It works well with high latency connections.Benefits of using Cached Exchange Mode in Outlook: This local copy of mail data is saved on the computer, which provides quick access to your data even when you’re not connected to the server and also helps you work efficiently during a low internet connection. While Online Mode connects to an Exchange server instantly, Cached Exchange Mode creates a copy(Cache) of your mailbox data in the form of a local copy. Set this to “enable” and apply the GPO.Cached Exchange Mode is one of the two modes that is used to connect Outlook with an Exchange account, the other one being the Online Mode. The desired setting can be found under User Configuration > Administrative Templates > Microsoft Outlook 201x > Outlook Options > Delegates > Disable shared mail folder caching. Before you can use a GPO, you have to install the necessary template files for Microsoft Office/ Outlook. These ADMX files are part of the “ Office 2013 Administrative Template files (ADMX/ADML)” or “ Office 2016 Administrative Template files (ADMX/ADML)” package.Ĭopy the Outlk16.admx or Outlk15.admx files to the PolicyDefinitions folder (either C:\Windows or Central Store), and the Outlk16.adml or Outlk15.adml to the corresponding language folder. If you want to apply this setting on a bunch of clients, you should use a GPO. Make sure that you use the appropriate version number for your Outlook! Otherwise this setting is applied, but not working. Please note the version number after “Office”. Then double click the file and confirm, that you want to import the registry file. Copy this text into a file and save it as disablecachedmode.reg.

This is the default behaviour since Microsoft Outlook 2010. If you want to disable this behaviour, you have two options:

When you use Microsoft Outlook in cached mode, what I always recommend, and you add additional mailboxes to your outlook profile, you will notice that the OST file will grow. Outlook will download the mailbox items (mails, calendar entries, contacts etc.), and store them in the OST file.
