OST is an efficient medium to use Exchange Server mailbox folders locally on the Outlook client when reliable internet connectivity is not available. It allows continuing with the mailbox functionality in the offline mode i.e., without connecting to the Server. There are several reasons that make OST data inaccessible.
There are several ways to convert OST to PST format which are as follows:
1- Drag and Drop Mailbox Items:
Dragging and dropping OST mailbox items to PST file format is, undoubtedly, the best way to convert data from OST to PST. To complete this, you will need to have a blank PST file in MS Outlook and then click and drag the desired items in the OST mailbox to a newly created PST file.
2- Outlook Import & Export Wizard:
MS Outlook Import and Export wizard is a successful way to convert OST file to PST file format in Outlook 2010. You can also select migrating OST results to Excel and CSV file formats using this particular method. However, you need to technically efficient to make the built-in import/export strategy. There are chances that you may lose access to your valuable data if the procedure executed inaccurately at any step.
OST to PST Recovery Software 