The post office database (wphost.db) in each post office contains all administrative information for the post office, including a copy of the GroupWise Address Book. This information is necessary for users to send messages to others in the GroupWise system.
For the location of the post office database, see "Post Office Directory" in GroupWise 6.5 Troubleshooting 3: Message Flow and Directory Structure. For more post office information, see Information Stored in the Post Office.