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NOTE: The procedures in this article only apply if you have installed Outlook with the Corporate or Workgroup option. With this option, you can use Messaging Application Programming Interface (MAPI) services. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Corporate or Workgroup installation, you see "Corporate or Workgroup".
This article describes how to check for new mail on the Microsoft Mail postoffice with Outlook.
When your e-mail server is a Microsoft Mail postoffice or Workgroup postoffice (WGPO) server, Outlook automatically checks for new mail every 10 minutes by default. You can enable immediate notification through network basic input/output system (NetBIOS), but all users must be configured for this feature to work consistently.
A Microsoft Mail postoffice is a passive database. There is no server-based mechanism to notify the user when new messages arrive. Similar to earlier versions of MS Mail for Windows client, Outlook must check for new mail that is waiting on the postoffice for retrieval into the client's mail storage file (.pst file). The polling interval is based on x minutes from the end of the last poll.
To change the polling interval: