Calc
Decide whether Calc can do the work your workbook does in Excel. The guide compares formula accuracy and punctuation, newer functions, pivots, charts and the VBA or Power Query that can settle it. I'd check a return copy before switching, because an XLSX that opens can still calculate differently.
Guides in this topic
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LibreOffice Calc vs Excel: formulas, macros and file compatibility
Calc opens XLSX, but a replacement must keep the workbook's next calculation, refresh and handoff working. Choose from those dependencies and preserve the original while checking a return copy.
