Bulk Deleting All Messages in a Folder in Microsoft Outlook Web Access [duplicate]
UPDATE
Just right click on the desired folder and select Empty Folder
Like dean said, you can hold Ctrl to select single items or even Shift to select multiple items.
I haven't used OWA in a long time but a little trick I used to do in Firefox was to use this javascript bit to select all of the checkboxes
javascript:var f=document.activeElement.childNodes1.contentDocument;var c=f.all['MsgID'];var i;for(i=0;i
type it in the address bar and hit enter, it should select all of the checkboxes.
I know that you can hold Control and select the items and then hit the delete button. You could try that.
While in your inbox, hit Ctrl+A. This will select all messages in your inbox. Do the same in your deleted folder to permanently delete the messages.
Warning! This will delete ALL messages!