Don't know how hotmail works (I recommend you switch to gmail), but most services have a checkbox next to the email (when looking at the inbox), so you check off the emails you want to delete, then click the delete button.

If you don't click any checkboxes, but click the delete button I imagine nothing would happen.

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon