This behavior occurs because it takes a long time to enumerate the folders. In extreme cases, if there are more than 10,000 folders, Outlook is very slow to open.Additionally, errors are logged in the Sync Issues folder and "9646" events are logged in the Application log. 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 may experience performance issues such as the following: For example, meeting updates may not be reflected in the primary, shared or delegated Calendar.
You experience decreased performance in Outlook if the Inbox, Calendar, Tasks, Sent Items, and 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 perform certain actions.
If you have lots of items in any single folder, you may experience symptoms such as the following in Microsoft Outlook:
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