MOSS Alerts - Error Troubleshooting

When setting up MOSS Alerts or Tasks you get the following error:
The following users do not have e-mail addresses specified: Username. Alerts have been created successfully but these users will not receive e-mail notifications until valid e-mail addresses have been provided
Set my e-mail address
Troubleshoot issues with Windows SharePoint Services.

Troubleshoot tips:
1) IF Profiles are imported from AD, and you have verified that the user's email address is populated in AD then go on and check to see if you have setup an import schedule for your User Profiles.
- From Central Admin --> Click on Application Management
- Under Office SharePoint Server 2007 Shared Services - Click on Creat or Configure this farm's Shared Services
- Click on the pull down menu on the defaul site and click on Open Shared Service Admin site
- Click on User profiles and properties
- Click start incremental/full import
- After completion of this verify import schedule: Configure profile import

2) If it's only a couple of users it will be easier to just make the change from the site collection
- From Central Admin
- Click on Site Actions
- Then Click on Site Settings
- Click on People and Groups --> All People
- Then click on the user you want to edit
- Edit and enter new email address