Stella exchange ost to pst converter software is the excellent software to convert all ost mailbox items into office 365 account this software converts all ost deleted items data in to pst file and support all version 32bit and 64bit ost file this software converts all ost mailbox items like emails items, contacts items, calendar items, task items, notes items in to pst file, eml file, msg file, emlx file, Html file mbox file and office 365 account. The Demo version of this software converts 25 emails in each selected folder.
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https://www.stelladatarecovery.com/email-migration/ost-mails-recovery-software.php