Microsoft Exchange OST Conversion - Version 3.0 Microsoft Exchange Offline Storage files store data including emails, calendar, journals, notes, contacts, tasks etc created by Microsoft Exchange 5.0, 5.5, 2000, 2003 and 2007 and Convert OST to PST files which can easily be read with MS Outlook. SysTools for OST to PST uses advance algorithm to scan the orphaned or inaccessible Exchange OST files and recover email messages and other items as much as possible, so to minimize the loss in data disaster. SysTools MS Exchange Offline Storage OST Software is effective email conversion software to convert emails, contacts, calendar, tasks, notes, appointment and journal etc. OST file conversion uses advance algorithm to scan the orphaned or inaccessible Offline Storage (.OST) file and recover your email messages and other items as much as possible, so to minimize the data lose. It can successfully recovers and convert emails from inaccessible OST files created using Microsoft Exchange 5.0, 5.5, 2000, 2003, 2007 and 2010 and gives access to the email data stored in them. Try the Demo Version of SysTools OST Recovery software Free of