Cannot Open Exchange OST - Version 3.6 If you cannot open Exchange OST file or its shows some kind of error, then it would be infected with corruption. In this situation, you need to scan infected OST file with the help of third-party tool. OST Recovery software is the best utility to convert user's emails from MS Exchange Offline Storage (.OST) files that have becomes unusable due to Exchange account deletion or some other reason.When you cannot Open Exchange OST, you should try our OST to PST conversion software that specially made to open Exchange OST file with converting your data. OST Recovery is uses advance algorithm to scan your 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.Try the Demo Version for Free of cost to check its processing. Get the full version of OST Recovery Software at the starting price of $99 only. Support team also ready to help you out at any time.