Challenge 2: Moving a VBA-Dependent Workbook to Calc — Solution Walkthrough

What will and won't work immediately after opening it:

The workbook's DATA — cell values, formulas, formatting, charts —
will generally open and display correctly in Calc, following the same
"most everyday content survives cleanly" pattern this chapter
establishes. The VBA MACROS, however, will NOT run — LibreOffice's own
macro language, LibreOffice Basic, is a genuinely different language
from VBA, not a renamed or slightly-adjusted version of the same
thing. Any button, keyboard shortcut, or automated process that used
to trigger a VBA Sub simply has nothing to run anymore in Calc, even
though the workbook itself opens without any error.

What they'd actually need to do:

Rewrite each macro's logic directly in LibreOffice Basic — reading
the original VBA code to understand what it was doing (variables,
loops, the object model, event handlers, exactly the concepts Excel
Advanced Chapters 6-8 covered) and reimplementing that same logic using
LibreOffice Basic's own syntax and object model. This is a genuine
rewriting task, not a conversion, import, or setting to toggle — there
is no automatic translation step that turns working VBA into working
LibreOffice Basic.

WHY THIS WORKS AS AN ANSWER
------------------------------
This is the direct, concrete confirmation of this chapter's own single
most important takeaway: macros are a fundamentally different kind of
interoperability problem than a font shift or a chart-type change —
they require deliberate engineering time, not a quick spot-check,
before they'll work again in the new environment.