You can use the professional MacSonik
OST to PST Converter for Mac which helps you to convert multiple file formats like PST, EML, MSG, Office 365, and MBOX file formats with transfer mailbox items emails, attachments, contacts, calendars, etc without harming any emails data. The conversion procedure can be completed completely with two easy actions and a few clicks. Overall, it doesn't involve any data manipulation and yields an accurate conversion result that is 100% safe.
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