Microsoft Excel is often used in conjunction with Willis Towers Watson's technology for data analysis, modeling, and reporting. While Willis Towers Watson offers sophisticated actuarial and risk management software, Excel provides a flexible tool for specific calculations, customized reporting, and ad-hoc analysis that complements the more specialized applications. It is important to note, though, that extensive reliance on Excel for core actuarial calculations or data management without proper governance and validation would not be advisable.