J'ai trouvé la rep sur le labo-microsoft :


You can update settings in Outlook with your custom PRF in several ways. For example:
• Use the /importprf switch. For example:
Outlook.exe /importprf \\server1\share\outlook.prf
Outlook starts and the PRF file is imported, changing the specified settings in the user’s profile in the registry.
• Set registry keys to trigger Outlook to import the PRF file when Outlook starts. First, set the value ImportPRF to the location of the PRF file. For example:
HKCU\Software\Microsoft\Office\11.0\Outlook\Setup\ImportPRF=­\\server1\share\Outlook.prf
Then, reset the Outlook FirstRun key to alert Outlook to process the PRF file. To do this, delete the FirstRun registry value HKCU\Software\Microsoft\Office\11.0\Outlook\Setup\FirstRun, or set its data to 0.