OST to PST 2003 Converter Software is powerful OST to PST conversion process that solves all queries of user who are facing problems related to OST to PST 2003 Recovery. How to convert OST to PST 2003? OST to PST converter provides the best answer of this question. OST to PST converter supports every version on Microsoft Exchange 5.0, 5.5, 2000, 2003, 2007, 2010 and 2013 and converts them into PST, MSG and EML format.