Get Microsoft Defender for Business

Defender for Business is a new endpoint security solution designed especially for small and medium-sized businesses (up to 300 employees). This article describes how to get Defender for Business.

If you don't already have Microsoft Defender for Business, you can choose from several options:

If you have signed up for a trial, after you receive your acceptance email, you can activate your trial and assign user licenses, and then proceed to your next steps.

Try or buy Microsoft Defender for Business

  1. Go to the Microsoft Defender for Business web page, and select the option to try or buy Defender for Business.

  2. When you receive your email with your account and subscription information, sign in using the link in your email.

  3. Proceed to Add users and assign licenses.

Get Microsoft 365 Business Premium

As of March 1, 2022, Defender for Business is included in Microsoft 365 Business Premium.

  1. Visit the Microsoft 365 Business Premium product page.

  2. Choose to try or buy your subscription. See Try or buy a Microsoft 365 for business subscription. On the Microsoft 365 Products site, choose Microsoft 365 Business Premium.

  3. After you have signed up for Microsoft 365 Business Premium, you'll receive an email with a link to sign in and get started. Proceed to Set up Microsoft 365 Business Premium.

Work with a Microsoft partner

Microsoft has a list of solution providers who are authorized to sell offerings, including Microsoft 365 Business Premium and Microsoft Defender for Business. To find a solution provider in your area, take the following steps:

  1. Go to the Browse Partners.

  2. In the Filters pane, specify search criteria, such as:

    • Your location
    • Your organization's size
    • Focus areas, such as Security and/or Threat Protection
    • Services, such as Licensing or Managed Services (MSP)

    As soon as you select one or more criteria, the list of partners updates.

  3. Review the list of results. Select a provider to learn more about their expertise and the services they provide.

How to activate your trial

When you receive your acceptance email, here's how to activate your trial subscription:

  1. In your acceptance email, select the link that includes your promo code.

  2. If you already have a Microsoft 365 subscription, sign in using your account. If you don't already have a subscription, follow the prompts to create a new account.

  3. When you sign in for the first time, you'll go to the Microsoft 365 admin center ( See Overview of the Microsoft 365 admin center.

  4. Use one of the following procedures, depending on your scenario:

    Scenario Procedure
    You're setting up a Microsoft 365 subscription for the first time. Select Go to guided setup and complete the following steps:
    1. Either install your Office apps now, or choose Continue to skip this step. (You can install your Office apps later.)
    2. If your company has a domain, you can add it now (this option is recommended). Alternately, you could choose to use your default domain for now.
    3. Add users and assign licenses. Each user you list will be assigned a license automatically. See Add users and assign licenses at the same time.
    You're adding a trial to an existing Microsoft 365 tenant.
    1. Go to the Microsoft 365 admin center ( and sign in.
    2. In the navigation pane, choose Users > Active users. Review the list of users.
    3. To assign licenses, follow the guidance in Assign licenses to users.

Two portals for setup

When you're ready to get started, you'll work with two main portals: the Microsoft 365 admin center, and the Microsoft 365 Defender portal.

Portal Description
The Microsoft 365 admin center ( Use the Microsoft 365 admin center to activate your trial and sign in for the first time.

You'll also use the Microsoft 365 admin center to:

  • Add or remove users.
  • Assign user licenses.
  • View your products and services.
  • Complete setup tasks for your Microsoft 365 subscription.
To learn more, see Overview of the Microsoft 365 admin center.
The Microsoft 365 Defender portal ( Use the Microsoft 365 Defender portal to set up and configure Defender for Business.

You'll use the Microsoft 365 Defender portal to:

  • View your devices and device protection policies.
  • View detected threats and take action.
  • View security recommendations and manage your security settings.
To learn more, see Get started using the Microsoft 365 Defender portal.


You can use the Microsoft Endpoint Manager admin center ( to onboard devices, and to configure security settings. To learn more about Intune, see Microsoft Intune is an MDM and MAM provider for your devices.

Next steps