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As mentioned in the title, we will discuss legacy authentication, what it is, why we should block legacy authentication, and how to do it. Let's begin!

What is legacy authentication?

Legacy authentication protocols are the basic protocols used by old office client applications. These are authentication methods commonly used by mail protocols such as IMAP, SMTP, POP3, Autodicover etc. These protocols are mainly used by old office365 client applications such as Outlook 2010.
These protocols do not support or enforce Multi-factor authentication attackers, therefore, prefer these entry points to attack your organization.

Below protocols are considered as legacy authentication protocols.

Authenticated SMTP
Exchange Online PowerShell
Exchange Web Services
IMAP
MAPI over HTTP
OAB (Offline Address Book)
Outlook Anywhere
Outlook Service
POP3
Reporting Web Services
Other clients

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This article will provide you an overview of Azure Policy and how to create Azure policy to help govern your Azure environment.

Azure Policy is a service that allows you to define policies that implement and control a resource's properties
It is a free feature in Azure that allows you to create policies and assign them to the resources. If these policies are not meeting, you receive alerts, and you can take action on those alerts.
Azure Policy can be used to build a custom validation layer against deployments to prevent deviations from customer-defined rules. A minimal amount of extensibility is possible and it is not a general-purpose Azure rules engine.

Benifits of Azure policy:

It is a set of guardrails around all your resources to ensure cloud compliance, prevent misconfigurations, and follow a uniform resource governance plan.
Having all your compliance data in one place will reduce the time you need to audit your environments.
By implementing policies at the core of the Azure platform, you will be able to increase developer productivity and reduce external approval processes.
You can control your cloud spending by controlling and optimizing it, with the help of Azure policy.

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