Question: how to export contacts from outlook windows 10?
Answer: Select File.
Select Open & Export > Import/Export.
Select Export to a file > Next.
Select Outlook Data File (. pst) > Next.
Under the email account you want to export contacts from, select Contacts.
Select Browse... and go to where you want to save your . ... 
Type in a file name and then select OK. ... 
Select Finish.