Method 1:  Select email message in Outlook > Click File > Save As > Save as type .msg with desired file name in a folder.  File can now be attached to other emails or uploaded as a file.

Method 2:  Open File Explore folder where you want to save the file.  Open Outlook, select the email and drag it into the file folder.  File can now be attached to other emails or uploaded as a file.

1. Open the email
2. In the upper right of email pane click More Options (icon: ...)
3. Select Print
4. Select Print
5. Under destination, select Save as PDF
6. Select Save