You might need to do this:
If the subscriber is using Microsoft Outlook 2000 as an integrated client that runs with a corporate
email server, before you install Desktop Messaging, make sure the subscriber is in Corporate
mode.
1 Start Outlook 2000 on the subscriber’s computer.
2 On the Tools menu click Options.
The Options dialog box appears.
3 Click the Mail Services tab.
4 Click the Reconfigure Mail Support button.
The Email Service Options wizard appears.
5 Make sure that Corporate or Workgroup is selected.
If it is not already selected, select it and complete the rest of the wizard.
-SD-