If you want to export OST to Office 365 then you need to firstly convert OST to PST afterthat you can export converted PST file to Office 365 account. But if you need any direct solution to do your task then you can use OST to Office 365 Converter. This tool is very easy to install and run.
Export OST to PST, a secure and reliable 3rd party software, allows its user to convert OST files to PST. With the help of an Export OST to PST software, users can also convert OST mailbox data into PST and various other file formats, including EML, MSG, MBOX, DBX, HTML, MHTML, RTF and TXT. Free trial version of the software is also available to evaluate its features and functionalities. For more information about the software, visit- http://www.exportosttopst.ost2pstexe.net