To enable the hotfix, follow these steps: Exit Outlook 2007. Start Registry Editor. In Windows Vista, click Start , type regedit in the Start Search box, and then press ENTER. If you are prompted for an administrator password or for confirmation, type the password or provide confirmation. o In Windows XP, click Start , click Run , type regedit in the Open box, and then click OK . 3. Locate and then click to select the following registry key: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\RPC Note If the RPC key does not exist, follow these steps: a. Right-click the Outlook key, point to New , and then click Key . b. Type RPC , and then press ENTER. 1. After you select the key that is specified in step 3, point to New on t...