Not just financial documentation, but everything. Planning staff levels, work assignments, quarterly reports, bonus calculations, pto administration, and more. There's likely people retiring that wrote an excel macro 20 years ago that still part of a critical business process.

For so much financial logic. Anywhere that a non-technical person is sat in front of a computer and given data you will find Excel.

It is amazing what knots they will tie in it to avoid learning an actully useful tool.