Too Many “Crud” Folders

I imported my Outlook 2007 pst file into WLM. I now have the following folders: Deleted Items, Junk E-Mail, Trash, and Spam. I don't need all these, so I would like to do two things. I would like to assign all Trash and Spam functions to the Junk E-Mail folder. Next I would like to delete both Trash and Spam folders. On the first item, I cannot find where in WLM to assign specific folder functions. On the second item, when I try and delete either Trash or Spam folders I get the error message,"the MAPI server does not allow" either folder to be deleted. Looking for suggests on how to resolve this. Also, when I was using Outlook 2007 I did not have either 'Trash' or 'Spam' Folders. They were only added after I opened WLM.