You receive "not enough memory" errors in Outlook when you have lots of cached public folders

Article ID: 2494570 - View products that this article applies to.
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When you expand a mailbox or public folder (except for the Inbox), Microsoft Outlook may display one of the following errors. Additionally, when you click the Address Book button on the toolbar, you may receive one of the following errors:

Cannot display the folder. There is not enough free memory to run this program. Quit one or more programs, and then try again.

Cannot expand the folder. There is not enough memory available to perform the operation.

The address list could not be accessed. You need more memory or system resources. Close some windows and try again.

When one of these errors is displayed, outgoing mail may get stuck in the Outbox folder and is not sent until you restart Outlook.


This problem occurs when your Outlook messaging profile includes a Microsoft Exchange account that is configured to Use Cached Exchange Mode, and you have lots of cached public folders. Usually, this problem occurs when you exceed approximately 1,000 public folders, or a gigabyte of space is taken.


To prevent this problem, keep the number of cached public folders to fewer than 1,000. Or, reduce the number of folders until the error or errors stop occurring. If you are experiencing this problem, delete some public folder favorites by using the Outlook client. In some cases, if you have too many favorites, you may be unable to delete the folders because the error occurs when you click the public folder favorites folder.

To delete the public folder favorites, follow these steps:

  1. Download MFCMAPI from
  2. Run MFCMAPI.exe.
  3. On the Session menu, click Logon and Display Store Table.
  4. If you are prompted for a profile, select your profile name, and then click OK.
  5. In the top pane, locate the line that corresponds to your mailbox, and double-click it.
  6. In the navigation pane (left-side pane), expand Root - Mailbox, and select the Shortcuts folder.
  7. In the results pane (right-side pane), locate the PR_FOLDER_CHILD_COUNT properties. The value contains the number of public folder favorites.
  8. In the navigation pane, right-click the Shortcuts folder, and then select Empty Items and Subfolders from Folder.
  9. Keep the default options, and then click OK.


Article ID: 2494570 - Last Review: September 5, 2013 - Revision: 2.0
Applies to
  • Microsoft Outlook 2010

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