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Microsoft
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series of office programmes developed by Microsoft

Download the free Microsoft 365 mobile app
Desktop and mobile app screenshots representing the organizational components of Microsoft 365
Create tiles demonstrating some of the free create possibilities with Microsoft 365
Screenshots showing virtual collaboration features of Microsoft 365 for students and educators
Microsoft Office, MS Office, or simply Office, is an office suite and family of client software, server software, and services developed by Microsoft. The first version of the Office suite, announced by … Wikipedia
Factsheet
Developer(s) Microsoft
Initial release October 1, 1990; 34 years ago (1990-10-01)
Preview release(s)
Factsheet
Developer(s) Microsoft
Initial release October 1, 1990; 34 years ago (1990-10-01)
Preview release(s)
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Microsoft
office.com
Login | Microsoft 365 Copilot
[*] Copilot in the Microsoft 365 Copilot app is available for Microsoft 365 Enterprise, Academic, and SMB subscribers with a work or education account. Microsoft 365 Personal and Family subscribers and free accounts can access Copilot at copilot.microsoft.com and on the Copilot mobile app
Top answer
1 of 2
2

What you are trying to do is completely wrong - why to reverse-engineer frontend app and one day to find that everything changed?

There is official REST API to ms outlook online and authentication mechanism via Azure AD - exactly to let third-party apps to work with MS online apps.

Try to checkout this:

https://learn.microsoft.com/en-us/graph/overview-major-services

and this:

https://learn.microsoft.com/en-us/graph/azuread-identity-access-management-concept-overview

2 of 2
0

POSTing to https://login.microsoftonline.com/kmsi will return a html with all the values you need:

<html>

<head>
    <title>Working...</title>
</head>

<body>
    <form method="POST" name="hiddenform" action="https://admin.microsoft.com/landing">
        <input type="hidden" name="code" value="0.AVwAAmogKpXYg0-1rfltzzT6ZQYAAAAAAPEPzgAAAAAAAAABAAA.AgABAAIAAAD--DLA3VO7QrddgJg7WevrAgDs_wQA9P-gWiQqeCHo-9FEKAxJ1WYio4IwurbBrT2hB561ujjKXXdH08Yoqwrn7KlDJ2Ybp0SP7VNeX0v0313oQy9u184OF9SUmmPCM9AqRp8cW_Oh9AhenJEP8ZThY680N5XdQ_xvTaxCdyu0G2rMld7Yp-fnmKxQsr3UrdysQW6qe9mEXX_IsUYecF46BYO2kh7XsLGLXDDdm1ZJa46G_wAN00fYPmxgH4dlsauqK0URhVxVFZrws3yuPWTJEn5VNhL2Z2cUdsFfBEAFdHDrjOujdxzJKbfqln2GqLcNP_3LdgHKx-atrIM7JXJfp_oJeKCwXwvK6tUa4bhvEotIeGhES_l_0kxOZQDIbBMU2yUoBYrn17fxUmTAOt-HpeYRQFYr4bymdVnRsfMINZCSbD-lOaW6oh-cvWYpxqbq8ZZ3tZ7OJzZKetSNtAwplcUjZZchysueXy3-t7u2nr8k27jrSe2DudpGcn1GY25kkGQyz-SiqVm70RsKT9Fb6lxoSm7I8zpAWfFnLZJtxYhddHRx4tA521wAXoXOhBZyc5I7_gZYk2a50QcxeJI0K88mXxyPNvndN4F8eCtRYp1X53LSFgs4XyJ2UzWo9LXsWZ_77Fz7Ivlz2n4AEZXVZlE_PnqYylRdOWDV2NdpBhgFB53geIEuiX9t4JVl0o8TdpPrYjgsiqGmtbg3ZO4J4c_CDLOzBBJemdpAEnkukRVKHt-ZcXKwMfWHjWmEi0p6Ji1GI92f0UO_ZTpUdXScKC4UQsPrWAU" />
        <input type="hidden" name="id_token" value="[TOKENVALUE]" />
        <input type="hidden" name="state" value="OpenIdConnect.AuthenticationProperties=78qNGNcn8xtuLU4P5T0Dz5QMprE4YNYcSnczbXtwxwZL-dMfErfi6EuAkBJw0mFDmV_sQY7Q3av60KFahCPqhj6hzPR_JtBiYotBBoHd0zSKjqM7HgdD_QMhKZKReePeYsiTgLZtXAcNmzRBdjtpeflCa4TTRQY7tqOvN2kOUZY" />
        <input type="hidden" name="session_state" value="16f47f33-cf2e-4300-9a9b-72276bd518f0" />
        <input type="hidden" name="correlation_id" value="1a7d67ed-2db0-44ea-a351-f9d70ff14229" />
        <noscript>
            <p>Script is disabled. Click Submit to continue.</p><input type="submit" value="Submit" />
        </noscript>
    </form>
    <script language="javascript">
    document.forms[0].submit();
    </script>
</body>

</html>

You must extract the values of each input and use it on the https://www.office.com/landing. Do not forget to encode the state value

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Google Groups
groups.google.com › g › zaproxy-users › c › P4aBaDQr6MQ
Microsoft Login Authentication
7. Browser makes another POST requests to this url for a reason that I didn't really understand :) https://login.microsoftonline.com/kmsi
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Microsoft
login.microsoftonline.com › jsdisabled
Something went wrong
We can't sign you in · JavaScript is required to sign in. Your browser either does not support JavaScript or it is being blocked · Enable JavaScript in your browser or use one which supports it · Terms of use Privacy & cookies
Find elsewhere
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Stack Overflow
stackoverflow.com › questions › 70775330 › how-to-perform-login-field-for-login-microsoftonline-com-using-jmeter
authentication - How to perform login field for login.microsoftonline.com using Jmeter - Stack Overflow
So try starting with your application login page and I believe you should be redirected to the login.microsoftonline.com with valid cookies and appropriate parameters
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Reddit
reddit.com › r/microsoft › is login.microsoftonline.com a legit address?
r/microsoft on Reddit: Is login.microsoftonline.com a legit address?
March 4, 2024 -

I have noticed the different URL and I'm wondering why this is different from the usual login.live page. I've noticed it is normally tied to Microsoft services so I never logged in through this URL, but wanted to ask if this is a legit Microsoft domain.

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Stack Overflow
stackoverflow.com › questions › 68793968 › how-pass-login-microsoftonline-com-authentication
.net - How pass login.microsoftonline.com authentication? - Stack Overflow
Did you try this ? stackoverflow.com/a/41058049/4836581 Also you can try adding &[email protected] to the URL - for username only.
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Microsoft
myaccount.microsoft.com
My Account
You need to enable JavaScript to run this app
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Det
fs.det.nsw.edu.au › adfs › ls
Browser SSO
JavaScript is required. This web browser does not support JavaScript or JavaScript in this web browser is not enabled · To find out if your web browser supports JavaScript or to enable JavaScript, see web browser help
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Brave Community
community.brave.app › browser support › desktop support
Https://login.microsoftonline.com/ redirects to google sign in - Desktop Support - Brave Community
February 4, 2025 - Description of the issue: When i log in to my company microsoft log in https://login.microsoftonline.com/ it redirects me to a google sign in page How can this issue be reproduced? sign in to https://login.microsoftonline.com/ Expected result: I expect to be signed in to the campany webpage/service i’m trying to access like on any other browser.
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Dynamics Community
community.dynamics.com › forums › thread › details
My iFrame displays login.microsoftonline.com refused to connect
Our D365 app presents an iframe on a form which loads another website (different domain) which conducts some Q and A then returns to a 'completed' page which is a D365 webresource html page · This works most of the time but occasionally we see 'login.microsoftonline.com refused to connect' ...
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e/OS Community
community.e.foundation › using /e/os › user queries
Login.microsoftonline.com can't be reached - User Queries - /e/OS community
March 3, 2023 - Hi there I own a FP4 running e/os/1.8.1-s-20230203257059-stable-FP4 and since about a month, I am not able to reach the server at login.microsoftonline.com, no matter how (switching networtk providers / WLANs, via vario…