After you change the Internet connection type of the Microsoft Exchange Server Connector for Post Office Protocol 3 (POP3) mailboxes from either the Modem or Terminal Adapter or Router options to the Full-time/Broadband Modem option, the POP3 connector continues to check for mail according to the original schedule. If you choose the Full-time/Broadband Modem option as the Internet connection type during installation and you do not change this setting, the POP3 connector queries the POP3 server for new mail every 15 minutes, Monday through Friday.

To configure the POP3 connector to download mail in 15-minute intervals:

1. Open the Exchange Administrator program,
2. Expand the tree on the left side until you see the Configuration container,
3. Click the Connections container, and then double-click Connector for POP3 Mailboxes in the right pane to view the properties sheet for the POP3 connector.
4. On the General tab of the POP3 connector properties, change the connection type to Modem or Terminal Adapter.

   NOTE: If there are no phone book entries, you receive the following warning message:

   A valid dial-up user name is required.

   After you click OK, type any username and password combination in the Dial-up Network Credentials dialog box. The settings are not used.

5. Click Schedule, adjust the schedule to download mail from the POP3 server every 15 minutes, and then verify that all entries in the "Weekdays" section are selected.
6. Click OK, and then click OK again.
7. Click OK when you are prompted to restart the service.
8. Double-click the POP3 Connector icon to view the properties for the POP3 connector.
9. Change the connection type to Full-time/Broadband Modem. This dims the Schedule button. The POP3 Connector attempts to log on to the POP3 server every 15 minutes.
10. Click OK to dismiss the POP3 connector properties, and then click OK when you are prompted to restart the service.

To prevent download failures due to improper POP3 configuration, configure your SBS server for DNS by performing the following steps. If you have a full-time Internet connection, such as, DSL, a cable modem, or a T-1 connection, configure your system settings with your Internet service provider's (ISP) DNS information by doing the following steps:

1. Right-click Network Neighborhood and click Properties.
2. Click the Protocols tab, and then double-click TCP/IP Protocol to bring up the properties sheet for TCP/IP.
3. Click the DNS tab. Click the Add button under "DNS Server Search Order". Enter your ISP's primary DNS server's (Internet Protocol) IP address in the dialog box. Click Add to accept the entry.
4. Repeat step 3 for any additional DNS servers that your ISP uses.
5. Click OK to close the TCP/IP Properties dialog box. Click the Bindings tab to update the system's network bindings.

   NOTE: For additional information about checking the binding order, click the article number below to view the article in the Microsoft Knowledge Base: 252713 How to Properly Configure Network Binding Order on SBS

6. Restart the server when prompted.

The above applies to::

• Microsoft Exchange Server 2003 Enterprise Edition
• Microsoft Exchange Server 2003 Standard Edition
• Microsoft Windows Small Business Server 2003, Premium Edition
• Microsoft Windows Small Business Server 2003, Standard Edition
• Microsoft Exchange 2000 Server