As you know, Microsoft Outlook is one of the most popular email clients, which prominently stores all the mailbox data either into OST file or PST file. There are many scenarios when an users need to convert OST file to PST format. Since this task can be done by manual method, but it quiet complex and time consuming, if you have bulk OST file. That is IT professional recommend to use OST to PST Converter. It is dedicated tool to convert OST file to PST format, maintaining all data integrity and folder hierarchy. It is capable to convert OST file to PST format without or without Outlook. I hope, it will be helpful to you.