The Top 10 List of Worst Business IT Decisions

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Personally, I’d put DEC’s failure to recognize that commercial VMS users weren’t remotely like mainframers in solid second place, although I can think
of some other contenders too — including AT&T’s purchase of NCR, the Defense Department’s choice of staff and criteria in the development of ADA, and
Intel’s decision to continue 64-KB block addressing in the i80286.

Link: linuxinsider.com