Ask Paul: December 15 (Updated) (Premium)

UPDATE: My answer to "Which Windows sign-in?" below has been updated to actually answer the question. :) --Paul

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It’s beginning to feel but not look a lot like Christmas, but I won’t let the lack of snow stop me from enjoying another great of reader questions. So let’s get this going.
More like Google Meat, amirite?
simont - α Ⓟ

One very surprising thing from the OpenAI fiasco that almost nobody commented on, is that the board used Google Meet for conference calls. An actual company that uses Google Meet. What do you think of that?

I realize this is humor. So please excuse the serious response.

Google said that Workspace had over 3 billion users worldwide in 2021, though I dispute that number as the vast majority of that must be free Gmail accounts. Third-party reports suggest that the paying number is closer to 6 million subscribers. But whatever, Meet (and the related Google Chat, these should be one product) is available to everyone in Google’s sphere. So, yeah, I assure you that Google Meet is used by many millions of people every single day.

By comparison, Microsoft 365 has north of 350 million paid commercial subscribers---it’s been a while since we got a hard number---while the latest figure for Teams is 300 million. And Meet usage apparently exceeds that of Skype.

FWIW, we use Google Meet when we meet with the newsletter folks at The Intelligence. It works great.

Finally, as I wrote in Cut Me Some Slack, Slack (Premium), Slack’s insane (perhaps literally illegal) billing policies triggered a rethink of what we use for day-to-day chat-based communications here at Thurrott.com. I got my wife’s account refunded by Slack, and Laurent and I will likely move off it soon (though I need to use it for the web team). Google Chat is my top choice, as we already pay for Google Workspace. (We don’t do much in the way of video meetings.)
Which Windows sign-in? (UPDATED)
SherlockHolmes asks:

Hello Paul. I've been using Microsoft 365 business standard for a year now. And the benefits of less advertising outweigh the price of just under €14. The question I have is about Windows. Is it possible to change the use of a PC afterwards? So from personal use to use for an organization and for work? Until now, whenever I wanted to use Microsoft 365 with Windows, I had to reinstall the computer.

UPDATE: Thankfully, a reader helped out here. And while it's not all that obvious, it's also not that hard:
Open Settings and navigate to Accounts > Access work or school. Click "Connect." In the "Set up a work or school account" window that appears, do not enter your email address. Instead, click "Join this device to Microsoft Entra ID." Then, sign-in as required. Now, when you sign-out, there will be a new entry on the lock screen for signing in as another user. Use your work or school account ID, authenticate as required, and you're in. Now you will see both account choices on the lock screen.

Than...