5 steps to convert / switch email messages from Outlook 2019, 2016, 2013, 2010, 2007 to HTML: Step 1: Free Download & run this Outlook to HTML converter Software on your system Step 2: Select Add file or Add folder option in tool panel, according to your need Step 3: Preview complete data in application interface with attributes Step 4: Choose HTML as saving option from the list of formats Step 5: Pick destination path & click convert tab for PST to HTML conversion