From my experience importing EML files into Outlook PST manually wasn’t as easy as expected. At first I tried the drag-and-drop method, but it only worked with a few files and didn't help when I had multiple EML files. Using a tool like DataVare EML to PST Converter worked best for me. It's easier to finish the whole process if you convert bulk EML files to PST at once. It opened my EML files in Outlook without any problems. All of my emails and attachments were saved. It surely saves me a lot of time and work.