> Are your accounting people quite young? Excel moves and changes stuff, though not on quite such an aggressive timeline.
Excel UI interface changes but it won't change your spreadsheet content, which is the core functionality Excel users care about.
I've been using 15 year old .xlsx files with no issues across Excel 2007, to 2021, and Excel online.
I've seen companies using files with an absurd amount of worksheets within the file, or with an absurd number of rows (up to the limit), and those haven't been broken.
And I don't remember transitioning from xls to xlsx to be that painful, but this might be untrue for people using some very specific features.
Excel UI interface changes but it won't change your spreadsheet content, which is the core functionality Excel users care about.
I've been using 15 year old .xlsx files with no issues across Excel 2007, to 2021, and Excel online.
I've seen companies using files with an absurd amount of worksheets within the file, or with an absurd number of rows (up to the limit), and those haven't been broken.
And I don't remember transitioning from xls to xlsx to be that painful, but this might be untrue for people using some very specific features.