Mark unread archived email as read. Keep your unread count in Outlook 2011 true.

gistfile1.applescript

tell application "Microsoft Outlook"
  
	set archiveFolderId to id of folder "Inbox" of folder "On my computer"
	set theCounter to unread count of mail folder id archiveFolderId
	set newestMsgId to count of messages in mail folder id archiveFolderId
	repeat with i from 0 to theCounter
		set is read of message (newestMsgId - i) of mail folder id archiveFolderId to true
	end repeat
end tell