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gpg4o

OpenPGP Plugin for Outlook 2010/13/16

4 Alternatives To gpg4o

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GPG4Win

GPG4Win is an encryption program for files and emails. The program encrypts emails and files so that they can only be read by those intended to receive them.

OneTime

Multiple timezones on one simple dial

Outlook-Privacy-Plugin

Outlook Privacy Plugin is a security extension for Outlook 2010.
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Toolsley PGPigeon

Simple but powerful OpenPGP-compatible message encryption webapp.