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Of course MS Outlook, because it's the official email of my company that I represent and which is safe.
MS Outlook would be preferable in order to be more transparent and privacy maintenance. Also most of the emails will be backed-up for future use.
Your office environment may be very different to mine to allow multiple platforms for communication.
Depending on how important is your corporate communication data is seen, large companies prefer using their own 'Secure' emailing methods by stricting.
However, They would use either Gmail or MS Outlook in conjuction with their own mailing server for security.