Problem: If you having problems with CRM 2011 Outlook client configuration wizard – and you get “removing the organization configuration” error. In logs (located C:\Users\yourusernamehere\AppData\Local\Microsoft\MSCRM\Logs) – you see this message Error Exception : Value cannot be null. Reason: The CRM client uses incorrect CRM server address stored in the Registry (for example it happened after CRM 4.0 upgrade). Solution: In registry – Computer\HKEY_CURRENT_USER\Software\Microsoft\MSCRMClient – remove whole folder (MSCRMClient) – to start the configuration wizard from the scratch. Then you can always run Repair from Control Panel – if you get any additional troubles. This solution may also solve other errors – for example error “No organization was found on the CRM server”. However first of all – have a look into the Registry MSCRMClient entries – to verify if it stores incorrect CRM server address. If it is the case – then deleting whole folder will help you.