That distinction matters when renewal notices arrive. The strongest available results were produced on current, connected systems with updates and cloud services available. For baseline malware protection, the evidence is highly favorable to Defender. For a complete paid security bundle, the decision still depends on what is enabled on the PC, which Windows edition is installed, how it connects to the internet, which browser protections are actually available, and whether the subscription’s extras are useful.
What the real-world result shows
AV-Comparatives’ February-to-May 2026 Real-World Protection Test gave Microsoft Defender a 99.0% protection result. Defender blocked 396 of 400 cases, with four compromises, and entered the lab’s top Cluster 1.
That is a strong outcome because a real-world protection test addresses the practical question: whether a security product stops a threat from compromising a PC. But its conditions are essential. The test permitted product updates and cloud connectivity, so it measures Defender as it is normally intended to operate on an up-to-date, internet-connected Windows machine. It is not an offline-only test or a guarantee against every attack technique.
AV-Comparatives’ clustering method also limits what “top tier” means. Products in the same cluster are considered equally effective for this comparison only where their false-positive rates remain below the industry average. The result therefore supports a narrow conclusion: under this test’s online conditions and methodology, Defender performed comparably with the other Cluster 1 products.
It does not show that every paid product matched Defender, nor that Defender and all paid suites offer the same capabilities. The test does not compare VPNs, password managers, identity monitoring, parental controls, backups, support, insurance offers, or other subscription extras.
Defender also recorded zero false positives in this real-world round. That does not mean paid products uniformly produced five false positives. The recorded results varied: Kaspersky and VIPRE had three; McAfee and Sophos had four; Avast, AVG, Bitdefender, Norton, and TotalAV had five. False positives matter because blocking a legitimate program, file, website, or installer can interrupt work and train people to disregard later warnings. Zero in one period is excellent, but it is not a promise that Defender will never flag a legitimate item.
The 89.2% figure is not Defender’s protection rate
A separate AV-Comparatives figure can seem much less reassuring when stripped of its label. In the March 2026 Malware Protection Test, Defender recorded 89.2% offline detection. That is not an overall local-only protection rate and should not be treated as one.
The test used 10,000 cases and evaluates multiple stages. It runs scans without internet access and with internet access, then executes samples that scans missed while internet and cloud access are available. Defender recorded 89.2% offline detection, 98.1% online detection, and 99.93% online protection, along with three false alarms and another Cluster 1 placement.
The distinction is useful for real purchasing decisions. Offline detection measures what the product recognizes before cloud-assisted checks and subsequent layers can contribute. Online protection measures the broader process after the missed samples are allowed to run with cloud access. For a normally connected Windows system, the 99.93% online-protection outcome is likely the more relevant measure of compromise prevention. For a machine that frequently lacks internet access or cannot reach Microsoft cloud services, the lower offline-detection number is a meaningful warning that the published test conditions may not match its use.
Microsoft describes cloud-delivered protection as optional but highly recommended for timely defense against emerging threats, and says it needs internet access to Microsoft cloud services to operate properly. The lab outcome and Microsoft’s guidance point in the same direction: Defender’s strongest results should be understood as results from a connected protection model.
That does not make public Wi-Fi equivalent to being offline. Public Wi-Fi commonly still provides internet access, and the available tests do not separately measure public-Wi-Fi risk. The practical issue is whether Windows can safely reach required services and whether the PC is updated and used cautiously on an untrusted network.
AV-TEST gives Defender full protection marks
AV-TEST’s May-to-June 2026 Windows 11 consumer evaluation reinforces the protection finding, with an important performance qualification. Using default settings with updates and cloud services available, the institute awarded Defender 6 out of 6 for protection, 5.5 out of 6 for performance, and 6 out of 6 for usability.
This is a very strong score, but not a perfect 18 out of 18. Bitdefender, ESET, F-Secure, Kaspersky, McAfee, and Norton each received 6 out of 6 across protection, performance, and usability in that round. Defender therefore matched those suites on the protection category, but not on the three-part total.
The result was not an isolated positive entry. AV-TEST’s Microsoft listings show 6/6/6 results in its February and April 2026 consumer rounds, before the half-point performance reduction in the June listing. That supports confidence in Defender’s recent protection consistency, while preserving the latest round’s performance difference.
Performance is a valid reason to compare products
AV-Comparatives’ April 2026 performance test provides more context for that half-point distinction. On a low-end Intel Core i3 Windows 11 PC with 8 GB of RAM, SSD storage, and an active internet connection, Defender ranked 11th with an impact score of 12.9.
That does not mean Defender is unusably slow. It does mean it was not the lightest option in that specific configuration. McAfee, Kaspersky, ESET, Trend Micro, Norton, Avast and AVG, G Data, K7, Bitdefender, and Panda recorded lower impact scores in the summarized results.
This is actionable for owners of older or entry-level Windows laptops. If scans, app installation, file copies, or general responsiveness are already frustrating, a competing product may have less measured impact in comparable conditions. Someone with modern hardware may reasonably prioritize the simplicity and cost benefit of Windows’ built-in antivirus instead. A single low-end test configuration cannot precisely predict the experience on every PC.
Browser and phishing protection: Edge and Endpoint are different scopes
Browser protection needs a more careful comparison than the malware-test scores permit. In the consumer Windows Security experience, Microsoft Edge includes SmartScreen protection. That is distinct from the system-level Network Protection feature documented for Microsoft Defender for Endpoint.
The Network Protection documentation says that it can extend web-protection functionality to supported non-Microsoft browsers and nonbrowser applications, but only where its stated prerequisites are met. Those include Windows 10 or Windows 11 Pro or Enterprise, active Defender real-time protection, and block mode for coverage in non-Microsoft browsers. It also documents browser and HTTPS limitations: blocking HTTPS fully qualified domain names in non-Microsoft browsers requires QUIC and Encrypted Client Hello to be disabled.
The crucial consumer takeaway is that a generic Windows 10 or Windows 11 Home installation should not be assumed to have, enable, or rely on Network Protection as equivalent cross-browser coverage. The cited material is Defender for Endpoint documentation, not proof that all Windows Security configurations supply identical protection in Chrome, Firefox, or another non-Microsoft browser.
That does not diminish Edge’s SmartScreen protection. It does mean that a person who uses another browser should verify the controls present on their specific device rather than infer coverage from Defender’s malware-test scores or from a feature documented in a managed Endpoint context.
Nor did the cited labs test feature-for-feature phishing protection, malicious-site blocking, browser-extension coverage, scam detection, or the paid suites’ privacy and support tools against Defender. Strong malware results are not a substitute for that absent comparison.
A practical checklist before cancelling a subscription
Cancelling can be reasonable for a connected home PC if the subscription is retained mainly for baseline malware protection. But make the transition deliberately:
- Identify the Windows edition. Check whether the device runs Home, Pro, or Enterprise. Do not assume that protections described for Defender for Endpoint apply to Windows Home.
- Remove only the product you intend to replace. After a compatible third-party antivirus is removed or absent, Defender is designed to turn on automatically. Confirm in Windows Security that Defender is the active antivirus rather than assuming the handover completed.
- Check live protection settings. Verify that real-time protection is active. Microsoft recommends cloud-delivered protection and automatic sample submission for optimal protection; cloud-delivered protection is especially relevant because the strongest cited results depended on internet and cloud availability.
- Verify actual browser safeguards. If Edge is the main browser, check SmartScreen. If another browser is central to daily use, establish what web-protection controls are available and enabled on that exact Windows edition and configuration. Do not treat Network Protection as a generic Home-PC cross-browser switch.
- Consider connectivity. A PC that routinely cannot access Microsoft cloud services does not resemble the online conditions that produced Defender’s best cited results.
- Inventory what the paid plan really provides. Determine whether its VPN, password manager, identity monitoring, parental controls, backup, support, or other features are actively used and would need replacing.
- Pay attention to PC performance. If the computer is an older, low-spec machine, compare the real experience after a change rather than relying solely on a general ranking.
When keeping paid antivirus still makes sense
A paid suite can remain a rational choice even when Defender’s malware protection is strong. It may impose less measured impact on a modest PC, provide support that a household values, or bundle services the household would otherwise buy separately. People who often work disconnected, cannot reliably reach Microsoft cloud services, or need a particular browser-protection workflow have reason to investigate their setup before switching solely to save money.
There is also a U.S.-specific exception to any product comparison involving Kaspersky. Its strong laboratory scores should not be treated as a normal consumer purchase recommendation in the United States. The U.S. Commerce Department prohibited Kaspersky from entering new agreements with U.S. persons beginning July 20, 2024. From September 29, 2024, the prohibition also covered antivirus signature and codebase updates and operation of Kaspersky Security Network in the United States or on U.S. persons’ IT systems. Its score remains a lab data point, not an ordinary updatable U.S. option.
The evidence-led conclusion
The independent 2026 results support a clear but limited conclusion: Microsoft Defender can stand alongside leading paid antivirus products for malware protection on a connected, updated Windows system. It reached Cluster 1 with 99.0% protection and zero false positives in AV-Comparatives’ real-world test, reached Cluster 1 with 99.93% online protection in the malware test, and earned full AV-TEST marks for protection and usability in the latest cited Windows 11 consumer round.
They do not show that Defender is universally identical to paid antivirus. Its latest AV-TEST total was lower because of performance, AV-Comparatives ranked it 11th on a particular low-end test system, and its best results depend on updates and reachable cloud services. Just as importantly, the cited labs did not compare every paid suite’s browser, phishing, privacy, support, and bundled-service features.
For many users, cancelling a renewal can be a defensible decision after confirming that Defender is active and that the protections actually available on their Windows edition and browser are enabled. For others, the correct comparison is not simply free versus paid antivirus, but the value of the whole package for their PC, browser habits, connectivity, and support needs.