Microsoft Outlook is a popular email clients, which stores all the mailbox data and all other items into 2 database file, which is called OST file and PST file. Several times OST file gets corrupted, damaged or orphaned due to various reasons, in this case, users could not access or open OST file data. Users can easily open OST file without Outlook by using best OST Viewer tool. It allow users view their OST file data including emails, contacts, calendars, notes and all other items, without working of Microsoft Outlook or without setting connection with the Exchange Server. Try a free trial version to know more details.