Deleting
SharePoint Lists from Outlook
By default we get SharePoint Lists in our Outlook list of
folders. If you want to delete them permanently, here is how to do
that.
Tools; Account Settings; SharePoint Lists tab; Press Remove
button. You'll see a window like this:

Press the Yes button. Then press Close button.
Lastly, you'll want
to right-click on SharePoint Lists in your Outlook Folder List and
select Close SharePoint Lists. Restart Outlook and they won't come
back.