Stella PST to ost convert software will be your most effective software for converting all data from ost files to a pst format. This program is specifically designed to convert corrupted and not mounted ost mailbox items to Office 365 accounts. The software can convert any version 32bit or 64bit ost files. The software can convert ost files to pst. transforms deleted items' data into a pst format file.

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https://www.stelladatarecovery.com/ost-to-pst.html