Custom actions are not included with Microsoft Outlook, but are add-ons in the form of .dll's created with C++ that add new capabilities to Outlook rules. Examples include printing automatically or adding a recipient to your address book. For a list of custom actions you can add, see:
- Custom Actions for Rules -- Source code sample available for some actions, including a custom action in a rule creates a rule that will always run only when the Outlook client is running.
Most custom actions have Action value parameters that you must set with the Change button on the Select Custom Action dialog box.
Custom actions in Rules Wizard rules do not work in Outlook 2002. According to a note posted at Ornic, the leading developer of custom actions, Microsoft has acknowledged the bug and plans to fix it in an upcoming version.