Will additional security be necessary with all I have with 365?

Harold Michaelis 20 Reputation points
2026-08-28T13:41:29.3833333+00:00

I want to know if additional security is necessary with 365, such as Norton.

Microsoft 365 and Office | Microsoft 365 Defender | For home | Windows
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DaveM121 929.6K Reputation points Independent Advisor
2026-08-28T14:17:47.52+00:00

1

By default if you are using Windows 10/11 you will have Windows Security provided as part of the operating system, that is a full security suite that includes the Defender anti-virus that gets its virus definitions updated usually on a daily basis, so if your keep your Windows system is up to date, you are protected.

2

Also, if you have a Microsoft 365 subscription you can usually install the standalone version of Microsoft Defender for free, depending on your region.

https://apps.microsoft.com/detail/9p6pmztm93lr

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  1. AI answer

    2026-08-28T13:41:41.9333333+00:00

    For a typical Windows device with Microsoft 365, additional antivirus such as Norton is generally not necessary.

    Microsoft already provides multiple layers of protection:

    • Microsoft Defender Antivirus is built into Windows 10 and Windows 11 and provides ongoing protection against viruses, malware, and spyware.
    • Microsoft 365 includes email protections such as anti-malware, anti-spam, and anti-phishing.
    • For Microsoft 365 for business accounts, security features can also include MFA, preset security policies, and protected collaboration in Teams, OneDrive, and SharePoint.

    If the subscription is Microsoft 365 Business Premium, it also includes Microsoft Defender for Office 365 Plan 1, which adds protections such as:

    • impersonation protection and phishing thresholds
    • Safe Attachments
    • Safe Links
    • protection for SharePoint, OneDrive, and Teams

    So in most cases, the built-in Microsoft security stack is sufficient without adding a third-party product like Norton.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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