Perform the following procedures if you want to keep the POP3 and IMAP4 configuration settings on your computer that is running Exchange 2007 after you upgrade to Exchange 2007 SP1.

To back up the settings in the POP3 and IMAP4 configuration files

1. On the Client Access server, navigate to C:\Program Files\Microsoft\Exchange Server\ClientAccess\PopImap, where C:\ is the directory in which you installed Exchange Server 2007.

2. Copy the following files and archive them in an alternative directory on your Client Access server:

   Microsoft.Exchange.Pop3.exe.Config

   Microsoft.Exchange.Imap4.exe.Config

3. Rename the version of the files that you copied to the alternative directory using a descriptive name. For example, you could name them the following:

   Microsoft.Exchange.Imap4.exe.Config_Pre-SP1

   Microsoft.Exchange.Pop3.exe.Config_Pre-SP1

To restore the configuration settings after you upgrade the Client Access server to Exchange 2007 SP1

1. Use any text editor, such as Notepad, to open the POP3 configuration file that you backed up in the previous procedure. For example, Microsoft.Exchange.Pop3.exe.Config_Pre-SP1.

2. Scroll to the end of the configuration file. Select the following lines of the configuration file, and then click Copy.

   <appSettings>

   <add key="MaxIoThreadsPerCPU" value="0" />

   <add key="ConnectionCacheSize" value="250" />

   <add key="ProtocolLog" value="false" />

   <add key="LogPath" value="C:\Program Files\Microsoft\Exchange Server\Logging\Pop3" />

   <add key="AgeQuotaInHours" value="24" />

   <add key="SizeQuota" value="10000000" />

   <add key="PerFileSizeQuota" value="1000000" />

   <add key="AllowCrossSiteSessions" value="false"/>

   </appSettings>

   Note:
   The values in the file that you backed up will differ from those in this example.

3. On the Client Access server, go to C:\Program Files\Microsoft\Exchange Server\ClientAccess\PopImap, where C:\ is the directory in which you installed Exchange Server 2007.

4. Use any text editor, such as Notepad, to open the file Microsoft.Exchange.Pop3.exe.Config, and then scroll to the end of the file.

5. Select the lines that contain the default configuration settings (that is, the <appSettings> line through the </appSettings> lines), click Paste to replace the default configuration settings with the settings on your clipboard, and then save and close the file.

6. Use any text editor, such as Notepad, to open the IMAP4 configuration file that you backed up in the previous procedure. For example, Microsoft.Exchange.Imap4.exe.Config_Pre-SP1.

7. Scroll to the end of the configuration file. Copy the following lines of the configuration file.

   <appSettings>

   <add key="MaxIoThreadsPerCPU" value="0" />

   <add key="ConnectionCacheSize" value="250" />

   <add key="ProtocolLog" value="false" />

   <add key="LogPath" value="C:\Program Files\Microsoft\Exchange Server\Logging\Imap4" />

   <add key="AgeQuotaInHours" value="24" />

   <add key="SizeQuota" value="10000000" />

   <add key="PerFileSizeQuota" value="1000000" />

   <add key="AllowCrossSiteSessions" value="false"/>

   </appSettings>

   Note:
   The values in the file that you backed up will differ from those in this example.

8. On the Client Access server, navigate to C:\Program Files\Microsoft\Exchange Server\ClientAccess\PopImap, where C:\ is the directory in which you installed Exchange Server 2007.

9. Use any text editor, such as Notepad, to open the file Microsoft.Exchange.Imap4.exe.Config, and then scroll to the end of the file.

10. Select the lines that contain the default configuration settings (that is, the <appSettings> line through the </appSettings> lines), click Paste to replace the default configuration settings with the settings on your clipboard, and then save and close the file.

11. Restart the Microsoft Exchange IMAP4 service and the Microsoft Exchange POP3 service.

For information about how to enable cross-site connectivity for your POP3 and IMAP4 clients, see How to Enable Cross-Site Connectivity for POP3 and IMAP4 Clients.