Use Registry Editor to Configure Outlook Web Access
Many Outlook Web Access configurations can be set using Registry Editor (Regedt32.exe). This section describes those registry keys that can be added to your computers running Exchange for customizing or managing your Outlook Web Access deployment.
Warning Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it, and you should also update your Emergency Repair Disk (ERD).
The following topics describe registry keys that will affect Outlook Web Access functionality in your organization. Where possible, links are provided to related Microsoft Knowledge Base articles on the Microsoft Product Support Services Web site, which is located at http://support.microsoft.com.
Note In Registry Editor, all Outlook Web Access registry keys are located in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA.