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In Microsoft Excel, there isn't a fixed maximum number of sheets that can be added to a workbook. Instead, the limit is influenced by the available memory (RAM) on your computer. Modern versions of Excel, starting from Excel 2007 onwards, are designed to handle more worksheets within a single workbook as long as your system's memory resources can support it. For practical purposes, this means you can add thousands of sheets without hitting a hard limit, but the performance of Excel might degrade as you add more sheets, especially if those sheets are complex or contain large amounts of data. It's also worth considering usability and navigation within a workbook with a very high number of sheets, as managing and finding specific information might become cumbersome. Therefore, while Excel technically allows you to add as many sheets as your system's memory can handle, it's advisable to keep the number of sheets to a manageable level and use other methods for organizing large datasets, such as leveraging multiple tables within a single sheet or using database solutions when appropriate.