A new data recovery tool can rescue mailbox files from crashed or corrupted Microsoft Exchange servers, even when the files are password-protected, its developer has claimed.

DataNumen, a software house based in Hong Kong, said that with the release of version 2.0, its Advanced Exchange Recovery tool can now recover data by scanning Exchange's OST offline storage files and saving it as Outlook PST files. 

The company added that the new version can also cope with OST files larger than 2GB, and can recover deleted items from the Exchange mailbox, including messages, whether plain text, RTF or HTML, attachments and embedded objects, appointments, tasks, notes and so on. 

Exchange's OST file is an offline copy of the mailbox on the server. However, if the server or mailbox is not available due to hardware failure or malicious software, the OST file is orphaned and inaccessible. Corrupt or damaged OST files cannot be accessed either. 

"Thanks to a byte-level scan performed by an advanced algorithm, Advanced Exchange Recovery 2.0 recovers every possible item in OST files," DataNumen claimed.

Other capabilities of the software include recovering and splitting oversized OST files, batch recovery, searching for OST files on the local PC, drag-and-drop operations, and the ability to work either via a command line interface or through Windows Explorer. It supports versions of Microsoft Exchange from 5.0 to 2007. 

A single-user license costs US$249.95 (around £180), with volume discounts available. DataNumen said that it also offers a free trial copy for download.