More likely the maintenance system ran only on old operating systems, Win XP or older.
If it is the maintenance systems scrambled and they don't have a historical backup, the planes are effectively scrap. Without a documented maintenance history, they won't be permitted to fly (leaving aside the maintenance scheduling aspects and the requirements to confirm). It may be they can fallback to paper, but my guess is the paper processing skills have long since been made redundant.
I've said it before, airlines are enormous nickel-and-dime IT shops with shiny planes in front of them. Without IT, your airline is grounded, there are many, many components to that IT and generally you can't just go to pilotjobs.com and hire in something different.