How do I sign in to both of them simultaneously in the same web browser? Is there a way to do so based on the domain that is being accessed?

I have a work Microsoft account used for Azure, Visual Studio, Office 365, and etc. that is username@company.org. I also have a personal Microsoft account that I use for Xbox Live, Bing, my personal PC, and etc. that is my Windows Live ID.

This worked up until about a week ago when suddenly, accessing one of the Microsoft services began redirecting me to a single signon page saying that I was already logged in with my personal account and that I would have to sign out to use my work account.

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    The better option to Incognito mode, since you will be limited to a single Incognito mode instance, is to use Chrome/Firefox profiles. You can switch profiles, from within Chrome, and access multiple accounts that way. IE11 and Edge do not support multiple instance so third-party software like Sandboxie can be used to get close enough. – Ramhound Feb 10 '17 at 18:06
  • I forgot about profiles. I'll give that a shot. – bynary Feb 10 '17 at 18:22
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    It's mid-2021 and Microsoft hasn't implemented yet multiaccount in the browser. This is quite an inconvenience, taking into account that Google has implemented this functionality since years ago. – AxeEffect Jul 24 at 10:02

What I do at work is use Incognito mode in Chrome for my personal accounts.

Just hit Ctrl+Shift+N from an open Chrome window, or you can find the option in the browser menu. Firefox and IE have a similar feature (Private window and InPrivate, respectively).

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    I've done this before, but I do QA work on multiple websites and need to clear cache, history, passwords, and etc. frequently. This would work great if I didn't need to do that. – bynary Feb 10 '17 at 18:30
  • Not a solution! – A X Aug 22 '20 at 20:17
  • @Abr ok? Why not? – wysiwyg Aug 22 '20 at 20:31
  • @wysiwyg Because the whole point of this question is to be signed in, in the same browser, at the same time and be able to easily switch between identities - similar to Google Accounts which allows multiple concurrent login – A X Aug 24 '20 at 2:41
  • @Abr understood, go ahead and flag if you think this answer doesn't pertain to the question – wysiwyg Aug 24 '20 at 2:47

The OP didn't ask specifically for Chrome, so if you're OK with Firefox, you can use the Test Pilot feature called "Container Tabs." Works great to sign in to multiple accounts from the same (or another) Firefox window.

See https://testpilot.firefox.com/about/ for details on Test Pilot and https://testpilot.firefox.com/experiments/containers for the Containers experiment.


Just hit Ctrl + Shift + N from an open Chrome window, or you can find the option in the browser menu. Firefox and IE have a similar feature (Private window and InPrivate, respectively)

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