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Originally posted by dans:
I have worked on Vanguard mail sold for use on the Nitsuko product line and Prophet voice sold as generic, both used the same software developed by CTL. Intra mail also uses the same software and came to market 2 years before Inmail. NEC had to engineer their phone systems software to work with the Intra mail and Inmail software but they did not develop it.
To set the record straight, IntraMail (and later InMail) were developed entirely by the Shelton engineering team. The only thing they have in common with the CTL products is some of the voice prompts and menus. (This was by design to unify the voice mail lineup.)

We introduced IntraMail on the DS-Series and later ported the software to Aspire and IPK-II. DSX has a much improved, feature-rich version which is now on the UX5000 and SV8100.