Question: how to transfer contacts from windows mail to outlook?
Answer: At the top of your Outlook 2013 or 2016 ribbon, choose File. ... 
Choose Open & Export > Import/Export. ... 
Choose Import from another program or file, and then choose Next.
Choose Comma Separated Values, and then choose Next.
In the Import a File box, browse to your contacts file, and then double-click to select it.