Fairly early, Bell Labs executives decided to mandate that Bell Labs organizations developing software for the Bell System use Unix, which was from the research

Fairly early, Bell Labs executives decided to mandate that Bell Labs organizations developing software for the Bell System use Unix, which was from the research organization. This led to many inventive rationales as to why a non-DEC computer and a non-Unix OS where really essential for specific applications. Resistance lasted for some time, but was eventually futile.