The quickly Upload OST into Office 365 file format, you can go with the best method of KDETools for OST to Office 365 Migration tool. The software is the well-performer solution & able to convert OST emails into Office 365 including all Emails properties or mailbox attachments.
The software works magically and capable to import OST to Office 365 format with quickly works to MS Outlook version (2019, 2016, 2013, 2010, 2007, etc.) OST files into Office 365 mailbox without getting any issue. Along with its application provides multiple features facilities like-
Updated Features for Migration data from OST to Office 365 account.
1- Batch Conversion Option.
3- Messages Filtering Option.
4- Export OST to Office 365 Including Zimbra, Gmail, PST, Live Exchange Server, EML, EMLX, MSG, MBOX, vCard, ICS, and etc.
5- Convert OST Files along with attachments.
6- All Windows Supports.
7- All MS Outlook Version supportable.
8- Select Desired location.
9- Preview of Converted Files.
Download freeware ATS OST to PST Converter application that easily exports entire OST mailbox data such as emails, contact, draft, task, calendar, image, archive file, to-do list, notes etc. into Outlook PST file format. This utility runs with any version of MS Outlook like 97/ 98/ 2002/ 2003/ 2007/ 2010/ 2013/ 2016 and 2019 (32 bit & 64 bit). This application has the great solution for every Outlook users. It does not affect the efficiency of OST file and protects all the information.You can do your work in offline mode with the help of this utility. The cloud-based application Office365 and Live Exchange Server are also supportable to save OST data.
To migrate the data from OST to Office 365 mailbox the user need to convert the OST file to PST first and after that import the data file of PST format into office 365 mailbox. If you have no idea how to transfer the data from OST to PST format you can take help of some conversion guide which I am sharing the right here:- https://www.softakensoftware.com/blog/convert-ost-to-pst.html