Sharing a little problem solving story

Thought I’d share this recent event. A non-technical colleague at work asked me to see if I could open up what he thought was an Excel spreadsheet, sent by another person to him. He wanted to rule out that it wasn’t an Excel version issue (I’m running 2010, him 2003). Like him, I was getting the same error, “file format is not valid.” However the subject of the email, as forwarded from the original sender,...

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