OST file viewer software is used to open and view exchange OST files. OST file viewer freeware is the best utility that can easily open and view normal and corrupted OST files. You can easily open and view OST files without installing Outlook. OST file viewer can export all the information of an OST file like emails, calendars, tasks, notes, deleted items, calendars, contacts, etc. to a separate HTML file so that users can access the data afterward. When the user opens an OST to review the data, the scanning process begins. The OST file viewer includes an option for creating a log file of the processes if users want to record them for future reference. OST File Opener is really helpful to open OST File(s). It is widely compatible with all the versions of the Windows operating systems and it also supports OST files created with any version of Microsoft Outlook like 2016, 2013, 2010, 2007, and below versions. This advanced software comes with an interactive and simple user interface that allows even novice users to use the tool with ease. Moreover, the utility helps to discover the OST file from the system which you want to access. It can also access inaccessible and password-protected files without any hindrances. Also, It allows viewing multiple OST files at a time. The tool also helps to view severely corrupted OST files by using provided recovery modes. It has three modes named Standard, Advanced and Deep mode which allow scanning highly corrupted files without any difficulty. Moreover, the tool comes with the demo version to access the files for free.