eSoftTools OST to PST Converter Software instantly converts OST files to PST files. This software is easy to understand and anyone can use this software with no issues. Antsy can convert OST with all its inner data and preserve that data to new PST and many more file types. MIgrate all mailbox items from OST files including emails, attachments, events, tasks, calendars, notes, and more. Smoothly Convert OST to PST, EML, EMLX, MHTML, MBOX, and more. In addition, upload all mailbox items from OST to Office 365, HTML, Yahoo mail, Gmail, and other Imap Accounts.