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Is Microsoft Defender good enough for business in 2026?
Yes. Independent labs put it in the same tier as the paid 3rd-party antivirus and internet security suites. The real question is not whether Defender protects the machine. It's whether you can see it across every machine you manage.
What do the results from independent labs show?
Microsoft Defender is as effective as 3rd party antivirus and internet security products.
- AV-TEST (January–February 2026, business Windows client): Microsoft Defender scored a perfect 18/18 across protection, performance and usability — one of ten products tied at top marks, alongside Bitdefender, Norton, Kaspersky, Avast and McAfee.
- AV-Comparatives (March 2026, malware protection test): Defender earned Advanced+ certification with a 99.89% online protection rate, against Bitdefender's 99.97% at the top of the field.
The spread between the best product tested and Microsoft Defender is about 8 samples in every 10,000. False-positive rates and performance impact are more meaningful differentiators than raw detection. In other words, Microsoft Defender is on par with the best.
Sources: AV-TEST business Windows client results and AV-Comparatives 2026 protection tests. Lab results may change every year — check the current round before making a decision.
So what are you actually paying for?
Essentially you are paying for a a cloud-managed console. Some products may include EDR, agents for Linux/Mac and extras like web filtering, encryption and email spam detection.
The most common reason companies (of any size) pay for a 3rd party antivirus product, is to centrally manage the security of their Windows machines. They can get notifications, initiate scans and see the status of each machine in a single dashboard.
Here's roughly what that console costs, using publicly reported SMB pricing as of July 2026:
| Product | Reported cost | At 100 endpoints |
|---|---|---|
| Webroot Business Endpoint | ~$30 / endpoint / year | ~$3,000 / year |
| Sophos Intercept X | ~$40 / user / year | ~$4,000 / year |
| Bitdefender GravityZone | $57–$96 / device / year | $5,700–$9,600 / year |
| Microsoft Defender (built into Windows) | included with the OS licence | $0 |
What would you save?
Put your own numbers in. This compares your current per-seat antivirus spend against running Microsoft Defender with DefenderMon as the console.
Endpoint protection savings calculator
Everything stays in your browser — nothing is sent anywhere.
Figures are per year. DefenderMon is free for up to 10 devices and $20/month flat for unlimited devices — the price doesn't change as you add endpoints.
When you should pay for a 3rd party antivirus?
Some reasons you may want to consider a paid 3rd party antivirus and internet security suite:
- macOS, Linux, or mobile devices. Microsoft Defender's is built for Windows only. Does not offer cross-platform agents.
- Advanced EDR or threat hunting. Microsoft Defender has advanced settings and capabilities. If you need advanced EDR with threat hunting a 3rd party antivirus and security suite might be better.
- Managed detection service (MDR/SOC). You need someone to watch alerts at 3am on your behalf. That's a service a cloud console cannot provide.
- Bundled extras. Web filtering, disk encryption management, email security, firewall integration, or backups.
- Strict compliance. A framework, or cyber-insurance policy that partners with a vendor of a specific product.
If the above don't really apply then you are paying a per-device annual subscription primarily for a management dashboard.
Where DefenderMon fits
DefenderMon is not an antivirus. Microsoft Defender is the antivirus and the internet security engine. DefenderMon is the management layer. One dashboard across every device, showing protection status, signature freshness, threat detections with remote remediation, and extensive configuration options such as ASR rules, exclusions, controlled folder access and more. You can push these settings as policies to your device groups. It also manages Windows updates, which 3rd party antivirus products do not. Patch automation is typically handled with yet another 3rd party product.
It needs no Intune, no Entra, and no Defender for Business licence, and it works on workgroup machines. It's free for up to 10 devices and $20/month flat for unlimited devices.
If the reason you are still paying per endpoint for Antivirus protection is for Remote Monitoring and Management, then DefenderMon is a much better choice.
Common questions
Is Microsoft Defender good enough for a business in 2026?
Independent labs put it in the same tier as the 3rd party antivirus and internet security suites. 18/18 at AV-TEST in early 2026, and Advanced+ at 99.89% with AV-Comparatives in March 2026. The practical gap is is management, reporting, and the extra services a 3rd party antivirus bundles.
Does Microsoft Defender include EDR or MDR?
The antivirus built into Windows does not offer extensive Endpoint Detection and Response. Microsoft's paid "Defender for Business" and "Defender for Endpoint" tiers, licensed separately do offer it. If you need EDR or a MDR, Managed Detection & Response service, that's a good reason to keep or buy a 3rd party antivirus and internet security suite.
What happens to Defender when I uninstall my third-party antivirus?
Windows brings Defender out of passive mode automatically and makes it the active antivirus. Remove the device from the old management console first so the product isn't reinstalled, and use the vendor's removal tool if the standard uninstall leaves remnants behind.
Is DefenderMon an antivirus?
No. Defender is the antivirus; DefenderMon is the console for it. It reports protection state, alerts on detections, pushes Defender configuration, and manages Windows updates. It does not detect or block threats itself.
Do I need Intune or a Defender for Business licence to use DefenderMon?
No. It works with the Defender that ships in Windows, on domain-joined or workgroup machines, without Intune, Entra, or a Defender for Business or Defender for Endpoint licence.