Batch converting multiple EML files into a single PST is easy with Advik EML to PST Converter. Start by launching the software and adding all your EML files or folders. Select PST as the output format and choose a destination folder. Click Convert, and the tool will merge all selected EML files into one PST file while keeping all attachments, formatting, and email properties intact. You can then open the PST in Outlook to access all emails together.