Free OST viewer tool to help you view OST files easily without connecting to MS Exchange Server. Administrators often face the heat of the situation when they have to look out for some important data in OST. Unfortunately, there is no such software or utility offered by Microsoft that allows a user to open OST file without MS Exchange Server connection. Resolving this issue, we offer you free ost viewer software that allows you to open ost file without the requirement of any connection with MS Exchange Server. This free ost file viewer software lets the user scan OST file and displays the data saved in it including email messages, contacts, calendars, notes etc in a proper folder structure. This is a free ost viewer tool and offers step-by-step instructions to open ost file. Simply select the source ost file, start scanning the selected ost file and the software displays the ost data for selection and retrieval. OST file viewer software displays the email items in a tree-like structure in the left pane of the software, so that you can navigate through the folder and see the desired email, contact, calendar items etc. However, this tool doesn’t allow you to convert OST to PST or save the email items in ost file. The software supports all versions of MS Outlook including MS Outlook 97, Outlook 2000, Outlook XP, Outlook 2003, Outlook 2007, and Outlook 2010, MS Outlook Express 4.0 and above, and MS Exchange Server 5.0, 5.5, 2000, 2003, 2007, and 2010.