Convert OST files with attachments without harming outlook OST file data. Using professional tools helps tackle all your problems Aryson OST to PST converter helps to convert your OST file into your desired file formats like MBOX, HTML, EML, EMLX, DOC, JPEG, PNG, etc. This advanced tool helps to migrate the outlook OST file to a number of email providers like Thunderbird, Outlook, Office 365, Yahoo mail, Gmail, etc. The best feature of this tool converts single and multiple OST files at once. It shows the preview of the OST file in a tree-like structure. In addition, it converts the OST file calendars to ICS format. If you want to learn other methods then read this article 3 easy methods to convert OST to PST in Outlook.