Hot Take Microsoft quietly reveals whether you need a third-party antivirus software in Windows 11

Gandalf_The_Grey

Level 85
Thread author
Verified
Honorary Member
Top Poster
Content Creator
Well-known
Forum Veteran
Apr 24, 2016
7,757
6
82,470
8,389
54
The Netherlands
First spotted by Windows Latest, Microsoft quietly published a detailed breakdown of Windows 11 security, and they finally addressed a critical question that users have debated for years. Do you still need a third-party antivirus for Windows PCs?

The short answer, according to Microsoft, is no. On April 9, Microsoft noted that Windows 11 is the most secure Windows yet, and it already includes a complete antivirus stack (Windows Defender) that runs by default and is updated automatically.

However, Microsoft isn’t making Windows Defender sound like a be-all and end-all security solution, nor is the company downplaying it, as they describe how Microsoft’s own antivirus negates the need for third-party antiviruses for most users, while also explaining when you need one.
In a support document spotted by Windows Latest, Microsoft says that for most users, the built-in protection in Windows 11 is enough, which assumes a typical setup with regular updates, default security settings, and standard usage patterns.
 
Short answer: for many home users, yes, Windows Security/Defender is enough if the system is kept updated and the default protections remain enabled.

What Microsoft is really saying

This is broadly consistent with Microsoft’s long-standing position:

  • Windows 11 includes a built-in antivirus and security stack.
  • For a typical home user, that protection is often sufficient.
  • That does not mean third-party antivirus is useless for everyone.

The important part is the condition behind it: updated Windows, enabled security features, and reasonably safe behavior.

When Defender is usually enough

For many users, built-in protection is adequate when:

  • Windows Update is working normally
  • Microsoft Defender Antivirus and SmartScreen are enabled
  • Tamper Protection is on
  • You are using a standard user account or at least not running everything as admin
  • You are not regularly downloading cracks, cheats, unknown scripts, or random installers

In that kind of setup, Windows 11 already has several useful layers, not just antivirus signatures.

Where third-party products may still help

A third-party suite may still make sense if someone wants:

  • More aggressive web filtering or phishing protection
  • Extra features such as firewall controls, device control, password tools, VPN, parental controls, or identity monitoring
  • A different interface or simpler alerts
  • Central management for multiple family devices
  • Protection tailored for higher-risk habits

That is more about features, management, and preference than “Defender is not real protection.”

Important caveat

No antivirus, including Defender or any paid suite, should be treated as a complete security solution by itself.

Real-world safety still depends heavily on:

  • Patch management
  • Browser hygiene
  • Using MFA on important accounts
  • Backing up data
  • Avoiding high-risk downloads and scripts

About the article itself

I cannot verify the full Microsoft document wording from the quote alone, so I would be careful with how strongly the Windows Latest article frames it. Tech news sites sometimes simplify vendor guidance for a headline. The safer conclusion is:

  • Microsoft considers Windows 11’s built-in protection sufficient for most normal users
  • That does not rule out third-party antivirus for users who want additional features or different protection layers

Bottom line

The old idea that every Windows PC must have a third-party antivirus is outdated. For many users, Defender is enough. But “enough” depends on the user’s habits, risk level, and whether they want extra controls beyond the default Windows security stack.

Sources
 
I agree with Microsoft. Unless you actively try to infect your PC with malware, you have nothing to worry about. But again, if you're trying to achieve that, no Kaspersky or Bitdefender will save you.

The only reason why people think Defender isn't capable to protect your PC is because it used to be crap when it launched. And of course media articles stating "security researchers bypassed Defender and installed malware", when they had option that prevents tampering with it disabled even though it is enabled by default.
 
Last edited:
Microsoft Defender alone?There are so many free and good hardening tools and also Firewall control
Microsoft Defender is strong, but it still lacks several key hardening and firewall capabilities that advanced users expect. HawkEye Hardening Console -Hard_Configurator (Andy Ful)-ConfigureDefender (Andy Ful)-FirewallHardening (Andy Ful) -Defender UI...
are well known, and has convinced me to use Defender, and its really good
 
I have Adguard Adblocker extension( not free but inexpensive especially on sale now) its rated as good, but Google claims Ublock orgin(free) is even better
Well security now is patch your browser and system, use an adblocker and reset your router every week and your on a good track. Not bulletproof but very close.

Why worry about exotic 0-day attacks anyway? You won't be able to stop even with 1000 anti exe's or hardening techniques.
 
I am just a home user,I have been advised that
True 0‑days used in the wild are:

  • Rare
  • Expensive (hundreds of thousands to millions of dollars)
  • Used by nation‑states, not random criminals
  • Burned quickly once detected so I am more concerned with
  • Malicious scripts
  • Drive‑by downloads
  • Phishing
  • Malvertising
  • Exploit kits targeting old, patched, or misconfigured systems
  • Social engineering
  • Credential theft
  • Supply-chain junkware
  • Abused LOLBins
  • Browser extensions
  • Misbehaving installers once again the advice is not my doing,I am a nave,this list is Googled
 
Last edited:
Just install Bitdefender free and call it a day. Maybe add an a identity protection and data remover that's really all you need.
Have never been hacked i see. Sorry to sound offensive, but your wording just sounded too cocky. What I would do at least is configure iti so it doesn't use default settings, or else you are just a default-box-with-default-AV. I remember somewhere seeing you say you test malware, aren't you a tad concerned about hackers? There are varying grades of hackers, those that don't pass as cybercrooks hack you and me. For Canada ( with a much smaller population than US) the national police record shows 48,371 cybercrimes in 2023, nothing to sneeze at. Though population wise 120 incidents per 100,000 population, still a low figure. But it doesn't account for un-reported incidents, which is common to most people - they just shrug and if they know that they should - reinstall.
Burned quickly
But with today's AI, they can make new ones effortlessly
 
Last edited:
Ididn't know, what is your advice ?
I would say use H_C, it closes off many attack methods. And use a default deny config beneath, like CyberLock. danb is opague sometimes because I think he didn't seek patents, but I have some blind faith for some reason. Or WDAC, which needs a new policy per added app. (very simple to do, just run WDAC Wizard and point to the app's path ).

That AI can dig up new vulnerabilities in addition to code attacks - least functionality is all I can think of - disable things you don't use. Just ruthlessly strip Windows down I guess - thus minimize the attack surface. I only surf (MT, Amazon, bill payment) and create documents, so thats easy for me to say :). When AI matures, switch to the lesser attacked platform like linux or dig up my Atari ST !
 
Last edited:
I have Adguard Adblocker extension( not free but inexpensive especially on sale now) its rated as good, but Google claims Ublock orgin(free) is even better
of course, I don't run chrome :rolleyes: but I do run firefox, librewolf, sometimes waterfox with ubo “Medium Mode” Dynamic Filtering (DF) + Hagezi filter set...
 
But with today's AI, they can make new ones effortlessly,Ididn't know, what is your advice ?
Stick with your setup and don't worry. You're someone who tries to stay informed so you're ahead of average folks. Remember: stay safe, not paranoid! :cool:
 
But with today's AI, they can make new ones effortlessly,Ididn't know, what is your advice ?
Reasonably speaking, I would expect the AI barons to finally be able to code guardrails into AI so it don't go hunting for vulnerabilities. But then, hackers can train their own private models but it should require resources that they don't have, I hope.
 
  • Used by nation‑states, not random criminals
  • Burned quickly once detected so I am more concerned with
The trend is shifting downward; zero-days now appear to be more used by commercial surveillance vendors than intelligence agencies. Ransomware groups are also using them.

They burn quickly (or once published, sometimes not that quickly) on fully patched systems. There are unpatched systems all over the place. There are probably more unpatched Android phones in the world than patched ones. Pegasus is still effective.
 
I have always used a third party AV & probably always will, that's really up to me, do I really need a £200+ ASUS router with AI etc on it when my ISP £20 supplied will do the job, maybe not, do I need cameras on my home? High quality door locks? Expensive loudspeakers? The list goes on & on .. Actually if I ran my PC how Microsoft really want me to I would not use MS at all, I have personal choices that some will & some won't agree with but they are my choices & it is my hard earned money I'm thinking - Each to their own always :):)
 
Microsoft Defender alone?There are so many free and good hardening tools and also Firewall control
Microsoft Defender is strong, but it still lacks several key hardening and firewall capabilities that advanced users expect. HawkEye Hardening Console -Hard_Configurator (Andy Ful)-ConfigureDefender (Andy Ful)-FirewallHardening (Andy Ful) -Defender UI...
are well known, and has convinced me to use Defender, and its really good
I and everyone I know use Defender alone on default settings. 0 infections and we're talking about average users that don't really know how to recognize scam, let alone what is malicious and what not. Windows Firewall is also more than enough as it blocks internet access to all new apps by default. I'd even argue your router firewall is even more important than Windows one.

And don't be fooled, @Andy Ful 's configurator is only as powerful as Defender/Microsoft, lets it be. His app doesn't do anything magical, just changes some settings for advanced users through registry. Something you could achieve simply by going to Group Policy Editor and changing the values yourself.
The main thing missing from MS & WD and AndyFul's/danb's tools is web protection. That is the main reason I use ESET even though I rarely get a popup.

Otherwise MS is not wrong, free is good enough if supplemented by some really good free tools like H_C or CL/WDAC.
Some kind of security DNS (Cloudflare, Quad9 or ControlD) + Google Safe Browsing and maybe some kind of security extension like Bitdefender Traffic Light if you're really paranoid, will do much better job than any antivirus software regarding web protection. And it costs you exactly 0,00€.

Security DNS servers usually use more than one threat intelligence source, along with Google Safe Browsing and Bitdefender Traffic Light, you're getting way better protection than just using one antivirus vendor.

I personally use Cloudflare Zero Trust + Google Safe Browsing in Firefox + uBlock Origin.
I have Adguard Adblocker extension( not free but inexpensive especially on sale now) its rated as good, but Google claims Ublock orgin(free) is even better
uBlock Origin is better because it gives user way more control than AdGuard extension. It also supports more syntaxes so pretty much all filter lists work in it correctly. And... it's way more efficient in resource usage than any other ad blocker out there. I'm talking about MV2 version, of course.
... and reset your router every week...
Ehm... why?
I am just a home user,I have been advised that
True 0‑days used in the wild are:

  • Rare
  • Expensive (hundreds of thousands to millions of dollars)
  • Used by nation‑states, not random criminals
  • Burned quickly once detected so I am more concerned with
  • Malicious scripts
  • Drive‑by downloads
  • Phishing
  • Malvertising
  • Exploit kits targeting old, patched, or misconfigured systems
  • Social engineering
  • Credential theft
  • Supply-chain junkware
  • Abused LOLBins
  • Browser extensions
  • Misbehaving installers once again the advice is not my doing,I am a nave,this list is Googled
You forgot one, if not the most important thing. Hackers target companies, not you as an average Joe. They are aware you won't pay ransom, companies might not have a choice if they want to continue functioning.

10 years ago, if not more, hackers targeted indiscriminately; it didn't really matter if you were an average Joe or the company. We were equal. Nowadays, they exclusively attack companies because why waste time on you when they can earn way more money in enterprise sector. You can clearly see this in ransomware attacks. Everyone was attacked when it came, now you rarely see someone getting it and more often how some company or hospital got attacked.
Stick with your setup and don't worry. You're someone who tries to stay informed so you're ahead of average folks. Remember: stay safe, not paranoid! :cool:
Finally someone with common sense! THANK YOU! 🙏🏻
If Microsoft says that I don't need a third-party antivirus, it's because I DO NEED IT. Microsoft's opinion is irrelevant, as is its quality of Windows updates. I will never use WD. Their opinion is so irrelevant that they themselves use third-party antivirus.
I have always used a third party AV & probably always will, that's really up to me, do I really need a £200+ ASUS router with AI etc on it when my ISP £20 supplied will do the job, maybe not, do I need cameras on my home? High quality door locks? Expensive loudspeakers? The list goes on & on .. Actually if I ran my PC how Microsoft really want me to I would not use MS at all, I have personal choices that some will & some won't agree with but they are my choices & it is my hard earned money I'm thinking - Each to their own always :):)
Everyone is free to use whatever they want. We're just pointing out that you don't need to spend hundreds of €/£/$ yearly in order to have excellent protection. I most of the cases, free products will protect you even better than paid ones.

I'll just comment on comparison regarding ISP routers; at least in my country, 99% population uses ISP supplied router. It's fast enough and people don't mess around in router settings. This way they don't have to buy equipment, set it up themselves and ISP takes care for everything in case of any issues. The only benefit of using your own router is having total control and way more features than ISP router couldn't even provide. But still... the fact is 99% of people don't need the features my own router has; people only want fast internet access and that's what every ISP-issued router will provide.

For me, 3rd party antivirus software is simply a scam. Just look at "protection modules" that your "antivirus" software offers. There's no better example than Android antivirus apps; these apps are everything except antivirus.