https://preview.redd.it/wfo7a5qzz4j91.jpg?width=960&crop=smart&auto=webp&s=6317262e4c98b7282e48fec09d7c9b0e01d933b6(image circulated on Twitter and Reddit, I can't tell which is the original source)
They did this in 2017. This is very old news: https://cointelegraph.com/news/microsoft-to-add-extensive-support-for-bitcoin-describes-it-as-currency
Can independently confirm. Excel did in fact add Bitcoin.
Nice
This is the mass adoption we have all been hoping for!