We recommend that you move several items in your larger folders to separate folders, or that you archive those items by using the AutoArchive feature. For more information, see Outlook performance issues when there are too many items or folders in a cached mode. If you have a large number of items in any single folder, you may experience performance issues during certain operations. Step 5 - Check whether your mailbox is too largeĪs your mailbox size increases, more resources are required to open each folder. Restore the add-ins one at a time until the problem does occur to determine which add-in is causing the problem.
If the problem does not occur after you restart Outlook, one of the add-ins is likely the cause of the problem.
For more information, see How to install the latest applicable updates for Microsoft Outlook (US English only). Make sure that the latest updates for Outlook are installed.
Install Windows updates in Windows Vista.To install the latest Office updates, click the link for your version of Windows, and then follow the steps in the article: By installing important, recommended, and optional updates, you can often correct problems by replacing out-of-date files and fixing vulnerabilities.
This might be because Windows Update is not configured on your computer to automatically download and install recommended updates. The Office installation on your computer might not be up to date. These steps are provided in a specific order based on commonality and complexity.