I heard that a lot of people migrate there OST file into PST and then import PST data to Office 365 accounts. You can move your OST data using this process but it actually very takes taking. However, nowadays you can simply upload OST data directly to Exchange Online accounts with the assistance of third-party software. MailsDaddy OST to Office 365 Migration Tool is one amazing and useful solution for this process as it provides direct and effortless migration of the OST file to O365 mailbox.
Use InQuit OST to PST Converter to recovery emails, inbox, outbox, sent-items, deleted-items, drafts, contacts, calendars, notes (to, cc, bcc, subject, date and time). You can convert single as well as multiple files into several file formats such as PST, MSG, EML, vCal, EMLX, vCard, MBOX, HTML and many more. To evaluate the performance of this tool you can download its free demo version that allows you to convert 30 emails per folder. If your OST file is heavy in size so you can split it into several smaller bit of PST file formats without losing any data.
Freeware ATS OST recovery tool allows users to migrate OST file into healthy PST file for each Mailbox of Database. Software performs conversion by keeping secure all Mailboxes, calendar, tasks, journals, sent items, delete items, draft etc. you are also able to maintain original data into PST file. Exchange Server connectivity is not required in order to retrieve OST file in some other reliable file format. With the help of this application, you can get back all the items of your OST file. You required downloading OST to PST Converter tool to extract data from OST file and import into PST without installation of MS Outlook.