Open an OST file in Outlook in just a few simple steps using eSoftTools OST to PST Converter Software, which is very easy to use, and this tool can easily open an OST file in any other file system. Also, with the help of this software, you can open emails in bulk in Outlook. By using this tool, you can open your OST file in Outlook as well as in other email clients like Yahoo Mail, Gmail, and Office 365. This tool has also been tested by humans, so there is no risk of losing the OST file data. Apart from this, this software also has a free demo version, using which you can open 25 emails in Outlook for free.