As you might notice there are only two resolution states in Operations Manager 2007, new and closed. Most likely you want to add more states. That you can do like this:

1. Start Operations Console
2. Click Administration and then Settings
3. Right-click Alerts and choose Properties
4. In the “Global Management Group Settings – Alerts” windo click “New…” and add resolution state. Click Ok, and then Ok again in the first box.
5. Now you can right-click a active alert (under Monitoring) and set the new resolution state