The majority optional solution by every outlook OST and office 365 users of
OST to office 365 Converter Software which has can simply convert OST to office 365 account without creating any issues. It OST to office 365 tool comes with an attractive GUI by which every user can migrate Emails OST to office 365 account without using any highly advance technical skills. You can utilize this OST to office 365 tool to Convert OST to office 365 accounts with maintain many files formats such as- PST, Zimbra, Gmail, EML, EMLX, vCard, ICS, MSG, Live Exchange server, MBOX and etc.
1- NO file size limitation.
2- Split Option.
3- Messages filters option.
More info-
OST to office 365 Migration