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You should also take this opportunity to examine the security configuration for your account and make sure to
add at least one multi-factor authentication method, or a passkey.

So from this notification all outlook versions prior to outlook21 will be made redundant.

Outlook 2007, Outlook 2010, Outlook 2013, Outlook 2016 MSI, Outlook 2019 LTSC. Any release of Outlook
Desktop with a version less than 11601.10000 does not support Modern Authentication for Outlook.com

What do you need to do?

If you are receiving this email, you are currently using an email or calendar app that uses a less secure authenti-
cation method to connect to your Outlook.com email account. You will need to upgrade your third-party mail
and calendar app to a version which supports modern authentication methods.

Microsoft provides free versions of Outlook for your PC, Mac, iOS, and Android devices which can be easily
downloaded and connect to your email account. Using an updated version of an Outlook application will ensure
you are connecting in the most secure way.

How can you set up your Gmail, Apple Mail, or other third-party mail application?

Various non-Microsoft applications will have their own steps for connecting to your Outlook.com email ac-
count using modern authentication methods. See our help article - Modern Authentication Methods now needed
to continue syncing Outlook Email in non-Microsoft email apps. However, you may need to contact the creators
of those applications to provide you with instructions. In many cases, simply removing and re-adding your ac-
count with the latest version of that application will configure it to use modern authentication methods.

There is a useful video about this topic, targeting non-tech-savvy users. The video explains

What modern authentication is,
What to expect, and
Guide you to Microsoft’s resources
Video: https://youtu.be/LTHkuXjTzZc