See all our Brands. Add-in Express is completely based on the Rapid Application Development approach and reduces the time you used to spend on Office extensions development at least by half. Add-in Express is the only tool that enables you to build shared, secure, version-neutral and deployable plug-ins for all available Office versions and applications. More News. This visual toolkit allows creating secure, managed, isolated, deployable and version-neutral plug-ins for Outlook Express and Windows Mail.
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