Are you searching for the best option to import MBOX files into an Office 365 account? Then you can try the BLR MBOX Converter Tool. This tool can simply export all MBOX files into an Office 365 account. There are users not need to download multiple tool to upload MBOX to Office 365 account.
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That’s great.. I didn’t find the real answer, but you gave the complete information. @emmettmason