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Email security · October 2026 Edition
Microsoft Defender for Office 365 vs Proofpoint Email Protection
Three of fourteen models named Microsoft Defender for Office 365 first on the direct prompt; three named Proofpoint Email Protection. Both were named by all fourteen models and Microsoft Defender for Office 365 carries 51 labels and Proofpoint Email Protection 59, so the shares are not directly comparable.
Named in three categories this edition.
Named in one category this edition.
First-choice share32%8%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate6%24%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#1#5A position in a field of 9; printed, not drawn.
Labels5159A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Microsoft Defender for Office 365 reading right to left. Rank and label count are printed, not drawn.Abnormal AI was named alongside these two in nine of the fourteen direct answers. Microsoft Defender for Office 365 vs SpamTitan · Microsoft Defender for Office 365 vs Mimecast Email Security · Microsoft Defender for Office 365 vs Barracuda Email Protection
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the email security page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
Microsoft Defender for Office 365First choices, of fourteen modelsProofpoint Email Protection
Direct332 against Proofpoint Email Protection
Paraphrase712 against Proofpoint Email Protection
Comparative25
Budget-constrained502 against Proofpoint Email Protection
Scale-constrained102 against Proofpoint Email Protection
Negative013 against Microsoft Defender for Office 365 · 6 against Proofpoint Email Protection
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Across every category in the October 2026 Edition, Microsoft Defender for Office 365 and Proofpoint Email Protection were named in the same answer 137 times, of the 176 answers naming Microsoft Defender for Office 365 and the 178 naming Proofpoint Email Protection. In those answers Proofpoint Email Protection took the first choice forty times and Microsoft Defender for Office 365 forty-three.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Microsoft Defender for Office 365 and Proofpoint Email Protection stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | ||||
| GPT-5.4 mini | | | | | ||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | |||
| Grok 4.20 | | | | |||
| Mistral Small | | | | |||
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | | | | |
| Kimi K2 | | | | | | |
| GLM 4.7 FlashX | | | | | | |
| MiniMax M2.5 | | | | |||
| GPT-6 Luna | | | | | | |
| Muse Glimmer 30B | | | | | |
Microsoft Defender for Office 365 Proofpoint Email Protection first choice named as an alternative argued againstblank: not namedEach cell is one answer, Microsoft Defender for Office 365 on the left and Proofpoint Email Protection on the right.The direct prompt
The plain question, one answer per model, grouped by where Microsoft Defender for Office 365 and Proofpoint Email Protection stood in it.
Microsoft Defender for Office 365 first, Proofpoint Email Protection an alternative
3 of 14 modelsProofpoint Email Protection was named in the answer but not as the choice, or not at all.GPT-5.4 miniMicrosoft Defender for Office 365 alternatives: Abnormal AI, Mimecast Email Security, Proofpoint Email Protection
Perplexity SonarMicrosoft Defender for Office 365 alternatives: Check Point Harmony Email & Collaboration, Mimecast Email Security
GLM 4.7 FlashXMicrosoft Defender for Office 365 alternatives: Abnormal AI, Barracuda Integrated Email Protection, IRONSCALES, Proofpoint Email Protection
Proofpoint Email Protection first, Microsoft Defender for Office 365 an alternative
3 of 14 modelsMicrosoft Defender for Office 365 was named in the answer but not as the choice, or not at all.Mistral SmallCheck Point Harmony Email & Collaboration, Proofpoint Email Protection alternatives: Mimecast Email Security, Symantec Email Security.cloud
Qwen 3.7 FlashProofpoint Email Protection alternatives: Abnormal AI, IRONSCALES, Microsoft Defender for Office 365
Muse Glimmer 30BProofpoint Email Protection alternatives: Abnormal AI, Barracuda Email Protection, Check Point Harmony Email & Collaboration, Guardian Digital, Microsoft Defender for Office 365, ThreatDown Email Security, Trustifi
Neither was the first choice, one was named
4 of 14 modelsThe answer put something else first and named one of the two as an alternative.Claude Haiku 4.5Barracuda Email Protection alternatives: IRONSCALES, Mimecast Email Security, Proofpoint Email Protection
DeepSeek V4 FlashAbnormal AI alternatives: Check Point Harmony Email & Collaboration, Microsoft Defender for Office 365, Proofpoint Email Protection
Kimi K2IRONSCALES alternatives: Abnormal AI, Mimecast Email Security, Proofpoint Email Protection
GPT-6 LunaAbnormal AI alternatives: Microsoft Defender for Office 365, Mimecast Email Security, Proofpoint Email Protection
Neither was named
4 of 14 modelsThe answer made no first choice from these two in this category.Gemini 3.5 FlashCheck Point Harmony Email & Collaboration alternatives: Abnormal AI, Barracuda Email Protection, IRONSCALES
Grok 4.20Proofpoint 365 Total Protection alternatives: Abnormal AI, Mimecast Email Security
Llama 4 Maverickno first choice
MiniMax M2.5Check Point Harmony Email & Collaboration, Mimecast Email Security
Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Microsoft Defender for Office 365 leads by sixteen points.
Microsoft Defender for Office 36527%#1 of 10Proofpoint Email Protection11%#2 of 10Mid-marketThe figures above
Microsoft Defender for Office 365 leads by twenty-four points.
Microsoft Defender for Office 36532%#1 of 9Proofpoint Email Protection8%#5 of 9Enterprise
The order flips: Proofpoint Email Protection leads at enterprise.
Proofpoint Email Protection48%#1 of 8Microsoft Defender for Office 36529%#2 of 8What the models said about Microsoft Defender for Office 365
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of seven in this category shown.
“Microsoft's published comparison, for example, uses different "missed threat" criteria for Defender than for competing gateways, so it shouldn't be treated as a neutral head-to-head ranking.” GPT-6 Luna · negative prompt · soft negative
“strong execution but limited vision for evolving threats. Complaints include high false positives, poor internal email scanning” Grok 4.20 · negative prompt · soft negative
“relying *solely* on native cloud email security is a risk for organizations with high threat profiles” Gemini 3.5 Flash · negative prompt · soft negative
“Microsoft Defender for Office 365 is the default choice for most Microsoft-365 shops—it's deeply integrated, cost-effective, and provides a solid baseline.” GLM 4.7 FlashX · comparative prompt · first choice
“Start with what you already have — if you're on Microsoft 365 E5, check if Defender for O365 Plan 2 is already included before paying for a new platform.” DeepSeek V4 Flash · scale prompt · first choice
“Microsoft Defender for Office 365 is the most pragmatic starting point—low cost, deep integration, and solid baseline protection.” GLM 4.7 FlashX · direct prompt · first choice
What the models said about Proofpoint Email Protection
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“the email security landscape has shifted heavily away from traditional, complex Secure Email Gateways (SEGs like traditional configurations of Proofpoint or Mimecast)” Gemini 3.5 Flash · paraphrase prompt · soft negative
“The industry has largely moved away from legacy, complex Secure Email Gateways (SEGs) that require changing MX records (such as Proofpoint or Mimecast).” Gemini 3.5 Flash · direct prompt · soft negative
“some email providers, such as Proofpoint, rely on static rules and predefined regex expressions to identify sensitive data, which may not be effective” Llama 4 Maverick · negative prompt · soft negative
“Proofpoint and Check Point Harmony Email & Collaboration are top choices due to their strong performance, scalability, and mid-market suitability.” Mistral Small · direct prompt · first choice
“Proofpoint Essentials is the most frequently cited "sized and priced for smaller environments" solution in 2026 vendor round-ups.” Muse Glimmer 30B · direct prompt · first choice
“Prioritize Gartner Leaders: Proofpoint, Abnormal Security, Mimecast... They score highest (4.4-4.8/5 on G2/Peer Insights)” Grok 4.20 · negative prompt · first choice
Also compared
Microsoft Defender for Office 365 vs SpamTitanMicrosoft Defender for Office 365 vs Mimecast Email SecurityMicrosoft Defender for Office 365 vs Barracuda Email ProtectionMicrosoft Defender for Office 365 vs Check Point Harmony Email & CollaborationMicrosoft Defender for Office 365 vs Abnormal AIMicrosoft Defender for Office 365 vs IRONSCALESSpamTitan vs Proofpoint Email ProtectionMimecast Email Security vs Proofpoint Email ProtectionBarracuda Email Protection vs Proofpoint Email ProtectionProofpoint Email Protection vs Check Point Harmony Email & CollaborationProofpoint Email Protection vs Abnormal AIProofpoint Email Protection vs IRONSCALESAll twenty-eight head-to-head pages and the full email security standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.