I just successfully upgrade from QB 2012 Premier with Payroll to QB 2021 (9 years differences) in a single shot.
- It converted directly the database from old to new format (2012 -> 2021)
- It restored backup from the older version (QB2012) as well
- THE BEST ONE: You can install them side to side on the same computer if you want to compare your old QB company file to you new one. Ensure you duplicate your company files first: one in QB2012 format and a new one in QB2021 format.
- Moreover our integration to import custom invoices using QBFC-11 dll (from C# applications) still work as before. I still can upgrade that to the new QBFC-14 in needs be.
I could not dream of better!
THANKS to QB engineers! That was a great job for maintaining compatibility!
