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A comment on IRS’ 60-Year-Old IT System Failed on Tax Day Due to New Hardware. Parent comment

Re:IRS’ 60-Year-Old IT System Failed on Tax Day Due to New H... by matchagaucho on Monday April 30, 2018 @04:45PM (#16962160)
At least this article acknowledges a period of "parallel validation" prior to retiring the old system.

Too many legacy migration projects fail to account for the active-active nature of migration.

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