Outlook 2007 Windows Vista Home Premium

I recently upgraded my PC to Vista and I have Outlook 2007.

The messages I want to delete in my inbox mailbox (IMAP) cannot be deleted
with one "delete" operation. With previous versoin of Outlook (2003), when I
wanted to delete unnecessary messages, all I had to highlight that message
and press the delete button.

With Outlook 2007, I can highlight and mark the messages, press the delete
button and the messages will show lines crossed horizontally on the subject
lines. But how do I permanently delete these messsages?

How can I insert an one touch button to my menu bar so the operation to
delete unnecessary messages are simpler?

Thanking in advance for someone's help!

sn