Source: GroupWise engine.
Explanation: The POA is not allowing GroupWise client users with older versions of the client software to access the post office.
Possible Cause: The administrator does not want older versions of the GroupWise client to access the post office. The client version can be controlled as described in "Checking What GroupWise Clients Are in Use" in "Post Office Agent" in the GroupWise 6.5 Administration Guide
Action: GroupWise client users must update their client software before they can access the post office. See "Updating Users' GroupWise Clients" in "Updating Your GroupWise 6.x System to Version 6.5" in the GroupWise 6.5 Installation Guide.