IF you, in fact used Microsoft Outlook.... The Full Version, then I would expect that there would likely be a PST (.pst personal store) file somewhere on your computer which you can open in Outlook anytime you want.
Personally, I store my PST file in a unique location on a different physical hard drive and when I reinstall Windows and then reinstall Microsoft Office, I'll point "Outlook" at that PST file when I reconfigure my four email accounts.
You might want to read this
We've had a lot of questions regarding Outlook, Outlook.com, Windows Live Mail and the Windows 10 "Mail". All of these are Microsoft e-mail products, but they are all very different - as they can sometimes be confused, this article explains a...
www.windows10forums.com
To confirm which version of the various Microsoft email programs you were actually using. It can be confusing sometimes.