Scenario

User A,B, and C send an email to user D on the Network. User D receives mail from A after about 5-10 min but nothing from B and C. User D then clicks on the email in the inbox from user A which then enables the email from users B and C to be received. All users are using Outlook 2000 through exchange server.

Problem

-Why does it take 5-10mins to receive the email and sometimes nothing is received at all?
-Why are the other emails received only when you click on a previous email in the inbox?

Possible solution
Fresh install of Outlook 2000????????