In Exchange 2003, how do I set the Outlook Web Access (OWA) public/private cookie timeout value?

All answers are at own risk:

For OWA, public computer cookie timeout:

Log-into the Front-end and start the registry editor.

Navigate to:

Enter a new DWord Value called PublicClientTimeout

Modify the value and click on Decimal and type in a value in minutes between 1 and 432,000.

Click OK.
You will need to restart IIS.

For the private computer cookie timeout:
create a DWord value called TrustedClientTimeout in the same place.
Enter a Decimal value between 1 and 432,000.