Stellar Converter for OST is described as 'performs secure conversion of OST files to Outlook-importable PST files Converts emails, contacts, notes, calendar entries, and journals Preview of converted messages in a three-pane structure Restores the original formatting of RTF'. There are more than 25 alternatives to Stellar Converter for OST for a variety of platforms, including Windows, Mac, Microsoft Office Outlook, Microsoft Office 365 and Outlook. The best alternative is ReliefJet Essentials for Outlook. It's not free, so if you're looking for a free alternative, you could try Ktools OST to PST Converter or Software Imperial OST to PST Converter. Other great apps like Stellar Converter for OST are MailsDaddy OST to PST Converter (Paid), Export Outlook Items to PST File (Free Personal), vMail OST to PST converter (Paid) and Jagware OST to PST Wizard (Paid).