Not able to add/remove delegates - Outlook 2007

Got this error message today, when trying to remove an user from delegates tab.

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Microsoft Office Outlook
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The Delegates settings were not saved correctly.  Cannot activate send-on-behalf-of list.
You do not have sufficient permission to perform this operation on this object.
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OK  
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I've found a solution in a Microsoft KB, which solved the problem quite easily. You just need to add a registry key, so with Outlook closed follow below steps

• Cick Start then Run and next type regedit, press Enter;
• Browse to HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Preferences;
• Click New on the Edit menu and select DWORD Value;
• Type IgnoreSOBError, press Enter. Right click the new key and click Modify;
• In Value Data type 1;
• Close Registry Editor and Reopen Outlook. You should be able to add/remove delegates from now on.