For batch transfer OST file to Exchange Online at once, you can install and launch the OST to Office 365 Converter Tool which offer the suitable working process to implement entire process. OST to Office 365 is most reliable and perfect solution for users to transfer OST file to Exchange Online including all emails, contacts, calendars, briefcase, and attachments etc. Date filter option available for those users who want to execute selective OST file conversion into O365 cloud. The software comes very simpler interface which can easily use by all type of users. Only the basic knowledge of computer required to perform the process to transfer OST file to Exchange Online. Moreover, after conversion process, it facilitate with save report option that will provide the complete report of conversion. Free demo version is also available.