I would like to eliminate from my Outlook for Mac (2011) a couple of thousand old emails. I don't want to eliminate all emails. Or even, necessarily, an unbroken line of emails (email headers, I guess is the correct terminology). But, in some cases, there may be 100 or 200 emails in a row that need to go, followed by a gap of two or three emails to keep, followed by another 50, etc. etc.