If you have a large mailbox or a slow Internet connection, this can take an hour or more. Not all items will be immediately available. When you re-launch Outlook, it will begin to make a copy of your Mailbox contents onto your local computer. You should see a notification window that advises you to restart Outlook in order for the change to take effect. In the Email tab, select Microsoft Exchange Server and click on Change.In Outlook, go to Tools > Account Settings.
If you have a large mailbox or a slow Internet connection, it can take an hour or more. When you re-launch Outlook, it will begin to make a copy of your Mailbox content to your computer. ost files has a preconfigured limit of 50 GB. It is not recommended to use Cached Mode when the mailbox size is greater than 25 GB as it might cause performance issues.
You should see a notification window that advises you to restart Outlook in order for the change to take effect:
You should be back at the Email Accounts window. In the Exchange Server Settings window, check Use Cached Exchange Mode and click on Next. In the E-mail tab, select your Exchange account and click on Change. In Outlook, go to the File > Account Settings, then click on Account Settings again in the dropdown. Note: if you want to turn off Cached Exchange Mode, follow the same steps, but make sure that the box next to Use Cached Exchange Mode is unchecked. Note: by default Cached Exchange Mode is enabled when adding an Exchange account.įor system recommendations for using Cached Exchange Mode, see the section Outlook Cached Mode Recommendations below. To enable Cached Exchange Mode, follow the steps below for your version of Outlook: Please double-check that the Cached mode is enabled and the offline data file was created to access the mailbox. Note: It is impossible to use the feature Work Offline if the Outlook is in Online mode. This may help improve the performance of Outlook on slow Internet connections. Outlook and the Exchange Server synchronize the local and server data periodically. Outlook accesses this cached copy for most operations speeding response times. While Online Mode maintains a direct connection to an Exchange server, Cached Exchange Mode creates a local copy of the mailbox data stored on the Exchange server in an offline data file (.ost file). There are two ways to connect Outlook to an Exchange account: Online Mode and Cached Exchange Mode. Important: this article applies to Outlook for Windows only.
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