Received excellent advice about a quick way to save Outlook 2016 tasks, calendar, contact and email files by going to: file, acct settings, data files, open file location...then rt click & copy. Can then close outlook and paste to any folder - and/or One Drive. Great. QUESTION - the file has the correct number of bytes...but is named "ost", not pst". Concerned that if I need to restore file, I might have a problem since it is not pst?

Thanks to someone who can put my mind at ease.