n. Extreme anger directed at computers and technology, particularly as a result of frustrations caused by a company's information technology policies or staff.
2001
'In focus groups, we were repeatedly told about something that people described as IT rage,' said John Pickett, editor and publisher of CIO Canada. That rage results from employees being asked to work with technology they don't understand, were not properly trained for or that is ill-suited for their tasks, he suggested.
1998 (earliest)
Both the BBC and The Scotsman are currently involved in major computer upgrades which gobble up vast amounts of staff time and money only a few years after the last IT upheaval. IT rage has become the defining characteristic of contemporary corporate life.
The abbreviation IT — short for information technology — is easily confused with the word it, so researching this phrase was difficult. However, it looks as though it only goes back to 1998, which is surprising since people have been tossing computer monitors out the window (or at least fantasizing about it) for a lot longer than that.