If you are looking for a solution to extract calendar from OST file then try Advik OST Converter tool on your system. The software allows you to export calendar from OST file in just a few simple clicks. It allows you to choose Calendar folder from OST mailbox folders. Using this tool, you can export OST calendar into ICS format. The interface of this utility is very simple and easy to use. Both technical or non-technical users can easily extract calendar from OST file without any technical knowledge.