How can I delete mails from the Windows Live Mail?

A week ago, I installed Windows Live Mail on my computer. So, I had to sincronize the WLM to have all the mails on the program. I left the computer downloading when I wasn't at home. When I arrived home I noticed that my hard drive had 5GB less of space. So, I unistalled the WLM thinking that would solve the problem but, in the end, my hard drive continued without the 5GB. How can I remove these mails from my computer without deleting them in my e-mail?

thank you. I have already found the mails paste and deleted it. Even so thank you for the tip.