For many reasons, users want to extract Outlook OST to Outlook.com and they want the best tool for this. Then I recommend using the very famous eSoftTools OST to PST Converter software as it gives the very unique feature for users' help. The software maintains the structure of emails and extracts Outlook OST to Outlook.com with full attachments. The software never harms your email file during the conversion process and it gives the free demo feature. Users can extract 25 files with complete data and users watch the free demo feature for every file.