A plug-in for Proofpoint Encryption is available for Microsoft Outlook 2003 and 2007 on the Windows XP, Windows Vista, and Windows 7 operating systems. When installed, the plug-in displays a Send Securely button in the Outlook interface that users can click to send secure messages. The Send Securely button adds a header to the message that triggers a Proofpoint Protection Server rule to encrypt the message.
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