With the mass delete feature, you can run an advanced query and delete multiple events from the query results.

1. On the Reports tab, click Advanced Queries.
2. In the Actions group, click Advanced Queries.
3. Create a new query or select a saved query.
4. In the Actions group, click Run.
5. To view the results of the query, navigate to the Results tab.
6. In the Results group, click Mass Delete.
7. To permanently delete the events, type DELETE in the text box and then click Continue.