Recovery Toolbox for Outlook open ost file can open ost files, created by Microsoft Exchange Server. Usually, these files cannot be opened with any other tool for open .ost file and open ost, but, you may need to access this archive offline and convert the source ost files into pst format, opened by any email program. Would you like to avoid losses and to access your personal mailbox in ost format, when corporate mail servers become inaccessible? Recovery Toolbox for Outlook can access and open ost files, that are stored on user workstation. Please use this chance to repair the entire mailbox on the same day after a failure. Please note, that the source file with ost extension is recreated, but, it will be empty, if your mail server was damaged. It means, that the entire mailbox can be lost, if other copies of your mailbox are absent. How to open an ost file, how to open ost files, how to open .ost file and how to open ost file? It should be noted, that there is a backup copy of your mailbox and it is stored on your workstation. But, you should download Recovery Toolbox for Outlook first, because other tools cannot open the input file with ost extension. Moreover, some items can be infected or damaged, therefore, trying other tools for opening ost files may be unsafe. In the same time, Recovery Toolbox for Outlook open .ost safely opens the source ost files and converts them into pst files, that can be opened offline by any email client, compatible with Microsoft Outlook open ost files.