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From the author of Office 365 and Network Security at Microsoft

Office 365 and Network Security at Microsoft

The overall networks that run the underlying Office 365 infrastructure are segmented to provide physical separation of critical backend servers and storage devices. These are set apart from any public-facing interfaces, and the implementation of edge router security provides the ability to detect intrusions and signs of vulnerability. All the client or external connections to Office 365 use SSL (Secure Socket Layer) for securing Outlook, Outlook Web App, Exchange ActiveSync, POP3, and IMAP as stated by Microsoft in a recent press release. All customer connections are encrypted using industry-standard transport layer security (TLS)/(SSL, which uses a secure client-to-server connection to help provide data confidentiality and integrity between the desktop and the data center. The TLS between Office 365 and external servers for both inbound and outbound email is also enabled by default.

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