Starting on October 5th, all Windows 11 users can start using Chat from Microsoft Teams on Windows. It is a signature, lightweight experience brought right to the Taskbar to let Teams personal accoun...
Updated Oct 05, 2021
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Blog Post
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Introducing Chat from Microsoft Teams on Windows 11, for your personal accounts
One of the things that always tickles me, is that personal Teams isn't even built from the ground up or technically "separate" at the service level. It's just regular business Teams built upon M365 Groups, Azure AD, and SharePoint Online, only with certain features hidden or stripped away.
Sign into a personal Teams account, and then browse to https://aad.portal.azure.com. You'll find that for every single personal Teams account, Microsoft creates a whole M365 tenant behind the scenes. Your account is an Azure AD user in that tenant with a domain derived from your personal MS account's address. There's 300 Teams (free) licenses in said tenant, one added to that user account. If you created any teams in personal Teams before the button disappeared, you'll see the M365 Groups and entire SharePoint Online sites behind them (with no restriction on storage that I can see). Heck you can even plug this tenant's name into https://[tenant]-admin.sharepoint.com and go tinker with your own personal SharePoint Online environment with 1TB of storage you didn't pay for.
At least with Skype and Skype for Business, they always existed as disparate services. Teams' foray into the personal realm, not so much.