Copilot in Excel: Brenda Has Another Problem
November 6, 2025
Another short essay from a real and still-alive dinobaby. If you see an image, we used AI. The dinobaby is not an artist like Grandma Moses.
Simon Wilson posted an interesting snippet from a person whom I don’t know. The handle is @belligerentbarbies who is a member of TikTok. You can find the post “Brenda” on Simon Wilson’s Weblog. The main idea in the write up is that a person in accounting or finance assembles an Excel worksheet. In many large outfits, the worksheets are templates or set up to allow the enthusiastic MBA to plug in a few numbers. Once the numbers are “in,” then the bright, over achiever hits Shift F9 to recalculate the single worksheet. If it looks okay, the MBA mashes F9 and updates the linked spreadsheets. Bingo! A financial services firm has produced the numbers needed to slap into a public or private document. But, and here’s the best part…
Thanks, Venice.ai. Good enough.
Before the document leaves the office, a senior professional who has not used Excel checks the spreadsheet. Experience dictates to look at certain important cells of data. If those pass the smell test, then the private document is moved to the next stage of its life. It goes into production so that the high net worth individual, the clued in business reporter, the big customers, and people in the CEO’s bridge group get the document.
Because those “reports” can move a stock up or down or provide useful information about a deal that is not put into a number context, most outfits protect Excel spreadsheets. Heck, even the fill-in-the-blank templates are big time secrets. Each of the investment firms for which I worked over the years follow the same process. Each uses its own, custom-tailored, carefully structure set of formulas to produce the quite significant reports, opinions, and marketing documents.
Brenda knows Excel. Most Big Dogs know some Excel, but as these corporate animals fight their way to Carpetland, those Excel skills atrophy. Now Simon Wilson’s post enters and references Copilot. The post is insightful because it highlights a process gap. Specifically if Copilot is involved in an Excel spreadsheet, Copilot might— just might in this hypothetical — make a change. The Big Dog in Carpetland does not catch the change. The Big Dog just sniffs a few spots in the forest or jungle of numbers.
Before Copilot Brenda or similar professional was involved. Copilot may make it possible to ignore Brenda and push the report out. If the financial whales make money, life is good. But what happens if the Copilot tweaked worksheet is hallucinating. I am not talking a few disco biscuits but mind warping errors whipped up because AI is essentially operating at “good enough” levels of excellence.
Bad things transpire. As interesting as this problem is to contemplate, there’s another angle that the Simon Wilson post did not address. What if Copilot is phoning home. The idea is that user interaction with a cloud-based service is designed to process data and add those data to its training process. The AI wizards have some jargon for this “learn as you go” approach.
The issue is, however, what happens if that proprietary spreadsheet or the “numbers” about a particular company find their way into a competitor’s smart output? What if Financial firm A does not know this “process” has compromised the confidentiality of a worksheet. What if Financial firm B spots the information and uses it to advantage firm B?
Where’s Brenda in this process? Who? She’s been RIFed. What about Big Dog in Carpetland? That professional is clueless until someone spots the leak and the information ruins what was a calm day with no fires to fight. Now a burning Piper Cub is in the office. Not good, is it.
I know that Microsoft Copilot will be or is positioned as super secure. I know that hypotheticals are just that: Made up thought donuts.
But I think the potential for some knowledge leaking may exist. After all Copilot, although marvelous, is not Brenda. Clueless leaders in Carpetland are not interested in fairy tales; they are interested in making money, reducing headcount, and enjoying days without a fierce fire ruining a perfectly good Louis XIV desk.
Net net: Copilot, how are you and Brenda communicating? What’s that? Brenda is not answering her company provided mobile. Wow. Bummer.
Stephen E Arnold, November 6, 2025
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