I was looking for the OST to PST Converter then a friend suggest me to use EmailsGuru OST to PST Converter. This tool directly convert my numerous OST files to PST format including emails, contacts, calendars, notes, journals and all other items. It help me to convert corrupted or damaged OST files to PST format. I am able to run this tool on an versions of Windows Operating Systems. Before purchasing this tool, I have used free demo version of this tool.