Excel Text Case Conversion

I have an Excel worksheet in which every text entry is stored in all-lowercase. I need that text transformed to clean, ALL UPPERCASE values throughout the file while preserving every other aspect of the sheet—cell positions, formulas, dates, and numeric data must remain untouched... (Budget: $10 - $30 USD, Jobs: Data Analysis, Data Management, Data Processing, Excel, Excel Macros, Excel VBA, Visual Basic, Visual Basic for Apps)