When you click a folder while you are using Microsoft Outlook, one of the following error messages may be displayed:
Error message 1
There is not enough free memory to run this program. Quit one or more programs, and then try again.
Error message 2
Unable to display the folder. There is not enough free memory to run this program. Quit one or more programs, and then try again.
You may experience this issue more frequently if you also use Business Contact Manager for Outlook (BCM).
This issue occurs because there is insufficient memory to display the folder. This may be caused by any one of many reasons. These reasons can include customizations that were made to the folder view, such as setting a filter. With Business Contact Manager for Outlook, the add-in subscribes to every folder in every store in the profile. Each MAPI subscription uses some shared memory. Therefore, large combinations of items and folders can deplete memory.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article numbers to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To work around the issue that is described in the "Symptoms" section, increase available memory. To increase the size of the memory heap, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then click to select the following registry subkey:
Microsoft Office Outlook 2007 with Business Contact Manager, Microsoft Office Outlook 2003, Microsoft Office Outlook 2003 with Business Contact Manager, , Microsoft Office Outlook 2007, Microsoft Outlook 2010