Applies to Outlook 2007, Outlook 2010
Problem: When you right-click on any of the folders that are listed down the left hand side in Outlook 2010 and choose Properties and then Home Page tab, the Home Page feature is disabled, preventing you from changing the address.
The home page setting is disabled in non-default data files “by design”, beginning with Outlook 2007. If you want to use a folder home page in other data files, you can configure a registry key to enable it.
In Outlook 2007, you need to edit this registry key and add the NonDefaultStoreScript value:
HKEY_CURRENT_USER\Software\Policies\Microsoft\office\12.0\common\security
DWORD: NonDefaultStoreScript
Value Data: 1 (Hexadecimal) to enable.
In Outlook 2010, you need to edit this registry key and add the NonDefaultStoreScript value:
HKEY_CURRENT_USER\Software\Policies\Microsoft\office\14.0\common\security
DWORD: NonDefaultStoreScript
Value Data: 1 (Hexadecimal) to enable.
After setting the registry value, you may need to restart Outlook for it to take effect.
Note that the Show folder home page checkbox is disabled (grayed out) until you enter a URL in the Address field.

Do It For Me
If you don’t want to edit the registry, download and run the appropriate reg file for your version of Outlook.
NonDefaultStoreScript – Outlook 2007
NonDefaultStoreScript – Outlook 2010
More Information
You cannot add a URL to the Address box on the Home Page tab in Outlook 2007 MSKB (also applies to Outlook 2010)
Outlook does not support rendering all types of folder home pages

