To improve Microsoft Outlook performance, we recommend that you enable Microsoft Exchange Cache Mode in Outlook.

To enable the Exchange Cache mode, perform the steps below:

1. Open Microsoft Outlook.
2. Select File, Account Settings, Account Settings.
3. Select the Mail Account that exhibits the issue, and click Change.
4. Under Offline Settings, select the Use Cached Exchange Mode checkbox.
5. Exit and restart Outlook.

NOTE: If you don't have the correct permission, you might be blocked from making the changes. Contact your Exchange Administrator for help with these steps.