Microsoft Excel expert and teacher Chandoo shares how the spreadsheet software helps him organize and better understand different aspects of his life. I'm an expert in software and work-related issues ...

Got a problem with an Excel spreadsheet. I have a non-specific data column in an Excel 2007 spreadsheet. The data in one column is zip codes in the form of both zip (5 digit, 00000) and zip+4 (10 ...

Purna Duggirala is better known as Chandoo. He runs a website—and newsletter, and forum, and podcast—at Chandoo.org, dedicated to teaching people how to use Microsoft Excel. Unlike some software ...