Ha ha! Roughly 1980.
My dad used to write computer manuals in the 60's.
He would talk about what a big deal it was when they stopped using "tapes" to record data.
It was "nice" to not use reel to real back then.
Lois Lerner perhaps hasn't heard the terms "disc drives", or "servers" or "mainframes".
Jeez. I WISH the IRS "didn't know" what my tax returns were for the past 40 years.
Guess I'm due for a substantial refund, plus interest.
Lost the data? Oh, so sorry.
Sucks to be the IRS, huh?
Go back and check the "tapes".
Even better, check the punch cards.
OTFLOL !!! I would not doubt it.