To uninstall Alert Manager 2007 your must retract the Alert Manager 2007 solution from each SharePoint web application, remove the Alert Manager 2007 solution from your solution store and remove the Alert Manager 2007 application from Add/Remove Programs. You can use the Component Configuration Manager to retract and remove the Alert Manager 2007 solution from your SharePoint Farm or manually remove the installed components with stsadm. Open the Component Configuration Manager from the start menu.

Start -> All Programs -> SharePoint Solutions -> Alert Manager 2007 -> Component Configuration Manager

The Component Configuration Manager provides a list of menu options, click Remove Alert Manager from a content site. Central Administration components can be removed by clicking Remove Alert Manager from the Central Admin Site.

The Component Configuration Manager will present you with a welcome screen that contains a summary of the actions that will be performed during configuration. Review the summary and click Next.

You will then be presented with the Alert Manager 2007 End-User License Agreement (EULA). Read the agreement, if you accept the terms click I accept the terms in the License Agreement and click Next.

A system check will then be performed to ensure all necessary dependencies are satisfied before the installation begins. Once the system check has completed click Next.

You will then be prompted to specify a list web applications you would like Alert Manager 2007 to be removed from. Select the desired web applications and click Next.

During the configuration you will be show a progress bar to monitor the status of events. When the configuration completes review the summary of the configuration and click Finish.

Once Alert Manager 2007 has been removed from your SharePoint Farm you can remove the Alert Manager 2007 installation components from Add/Remove Programs.