And when that day comes, the ghost of MYOB Premier 7.5 will finally rest. Do you still have a legacy MYOB serial number sitting in a drawer? You might be sitting on someone’s financial lifeline.

That 10-digit (or less) code is the only thing standing between a business and a decade of lost financial memory. If you no longer need it, consider posting it to an archival forum like the Internet Archive’s Software Collection or the Vintage Computing wiki.

The responses are a mix of sympathy, tech wizardry, and outright piracy.

And then there’s the hero—usually a retired bookkeeper—who posts: “I have an old license for Premier 7.5, single-user. PM me.”

They are locked out of their own financial past. Desperation creates strange markets. On obscure forums like Whirlpool (Australia) and Reddit’s r/Bookkeeping, you’ll find threads from 2018, 2019, even 2022, titled: “Does anyone have a working MYOB Premier 7.5 serial number?”

They call MYOB support. “Sorry,” says the voice on the line, “we discontinued support for version 7.5 in 2012. We don’t have those records anymore.” They search old emails. Nothing. They check the cardboard box the software came in. Nothing.

Better yet, fire up an old Windows XP virtual machine, install Premier 7.5, and export those company files to PDF or CSV. Migrate the data forward. Because someday, that serial number won’t just be hard to find—it will be impossible.

Why? Because MYOB (Mind Your Own Business) used that number as the master key to unlock a specific feature set. Premier 7.5 wasn’t a one-size-fits-all product. Depending on your serial, you got a different number of company files, multi-user licenses, or industry-specific payroll features. Lose that number, and you effectively bricked your own accounting history. Fast forward to 2015. Microsoft has long since ended support for Windows XP. MYOB has moved on to version 19, then 20, then the cloud. But there’s a plumbing business in suburban Melbourne still running Premier 7.5 on an old Dell desktop. Why? Because upgrading means converting 12 years of historical data. And converting means risk .