Serious problems might occur if you modify the registry incorrectly. The limits for Outlook 2019, Outlook 2016, Outlook 2013, and Outlook 2010 are as follows:įollow the steps in this section carefully. This problem might occur if you have folders that exceed the limit for the number of items per folder or if you have too many folders total. This behavior occurs because it takes a long time to enumerate the folders.
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If your Outlook profile has shared mailboxes and has caching enabled ( Download Shared Folders is selected), folder synchronization issues, performance issues, and other problems occur if the number of shared folders per mailbox exceeds 500, as described in Performance and synchronization problems when you work with folders in a secondary mailbox in Outlook.
Folders are not displayed correctly, or they take a long time to appear, especially in cached mode.If you have lots of mail folders, you might experience performance issues such as the following: For example, meeting updates might not be reflected in the primary, shared, or delegated calendar. You experience decreased performance in Outlook if the Inbox, Calendar, Tasks, Sent Items, or Deleted Items folders contain lots of items.When you use Cached Exchange Mode or an Outlook data (.pst) file, you notice performance issues when you do certain actions.If you have lots of items in any single folder, you might experience symptoms such as the following in Microsoft Outlook: