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Where are files and emails stored using Workspace 365?

All files and emails are stored at Office 365 thanks to our integration. So your files and emails are in highly secured data centres at Microsoft. These data centres are secured physically and digitally for 24 hours a day. The information can be send encrypted between the data centre and the user. Workspace 365 users log in using Office 365 via Single Sign-On. For more info: https://protection.office.com