Try STELLA OST to PST converter software convert all the ost file data in into pst file. Stella ost to pst converter software support all the version of the exchange ost file. Stella ost to pst converter software convert all the ost items in to office 365 account. Ost to pst converter software converts all the ost items into eml file, msg file, mbox file, mhtml file. demo version of the software converts 25 emails in each folder.
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https://www.stelladatarecovery.com/ost-to-pst-recovery.html
