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Email security · September 2026 Edition
Microsoft Defender for Office 365 vs Proofpoint Email Protection
Three of twelve models named Microsoft Defender for Office 365 first on the direct prompt; three named Proofpoint Email Protection. Both were named by all twelve models and Microsoft Defender for Office 365 carries 47 labels and Proofpoint Email Protection 49, so the shares are not directly comparable.
Named in one category this edition.
Named in one category this edition.
First-choice share31%10%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate9%12%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#1#3A position in a field of 9; printed, not drawn.
Labels4749A 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 twelve direct answers. Microsoft Defender for Office 365 vs Abnormal AI · Abnormal AI vs Proofpoint Email Protection
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve 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 twelve models made each the first choice, per way of asking, and how many argued against it.
Microsoft Defender for Office 365First choices, of twelve modelsProofpoint Email Protection
Direct331 against Microsoft Defender for Office 365 · 2 against Proofpoint Email Protection
Paraphrase531 against Proofpoint Email Protection
Comparative131 against Microsoft Defender for Office 365
Budget-constrained90
Scale-constrained101 against Proofpoint Email Protection
Negative112 against Microsoft Defender for Office 365 · 2 against Proofpoint Email Protection
Bars are first choices, 0 to 12 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to twelve.
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.
Both were the first choice
1 of 12 modelsThe answer named them together, and the judge labeled each a first choice.MiniMax M2.5Microsoft Defender for Office 365, Proofpoint Email Protection alternatives: Abnormal AI, Mimecast Email Security
Microsoft Defender for Office 365 first, Proofpoint Email Protection an alternative
2 of 12 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: Proofpoint Email Protection
Qwen 3.7 FlashMicrosoft Defender for Office 365 alternatives: Abnormal AI, Barracuda Email Protection, Mimecast Email Security, Proofpoint Email Protection
Proofpoint Email Protection first, Microsoft Defender for Office 365 not the choice
2 of 12 modelsMicrosoft Defender for Office 365 was named in the answer but not as the choice, or not at all.Grok 4.1 FastMimecast Email Security, Proofpoint Email Protection alternatives: Abnormal AI, Barracuda Email Protection
Mistral SmallBarracuda Email Protection, Proofpoint Email Protection alternatives: Abnormal AI, Mimecast Email Security
Neither was the first choice, one was named
4 of 12 modelsThe answer put something else first and named one of the two as an alternative.Perplexity SonarMimecast Email Security alternatives: Proofpoint Email Protection
DeepSeek V4 FlashAbnormal AI, Check Point Harmony Email & Collaboration, IRONSCALES alternatives: Barracuda Email Protection, Microsoft Defender for Office 365, Proofpoint Email Protection
Llama 4 MaverickBarracuda Email Protection alternatives: IRONSCALES, Proofpoint Email Protection, SpamTitan
Kimi K2Abnormal AI, IRONSCALES alternatives: Barracuda Email Protection, Microsoft Defender for Office 365, Mimecast Email Security
Neither was named
3 of 12 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5Barracuda Email Protection alternatives: Abnormal AI, Check Point Harmony Email & Collaboration
Gemini 3.5 FlashAbnormal AI, Check Point Harmony Email & Collaboration alternatives: IRONSCALES, Sophos Email, Sublime Security
GLM 4.7 FlashXMimecast Email Security alternatives: Abnormal AI, Barracuda Email Protection, Egress, IRONSCALES
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 thirty-eight points.
Microsoft Defender for Office 36544%#1 of 10Proofpoint Email Protection6%#3 of 10Mid-marketThe figures above
Microsoft Defender for Office 365 leads by twenty-one points.
Microsoft Defender for Office 36531%#1 of 9Proofpoint Email Protection10%#3 of 9Enterprise
The order flips: Proofpoint Email Protection leads at enterprise.
Proofpoint Email Protection40%#1 of 9Microsoft Defender for Office 36538%#2 of 9What 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 eight in this category shown.
“Limitation: Research shows third-party solutions are significantly more effective (44-93x according to some vendors)” Kimi K2 · comparative prompt · soft negative
“You should be cautious about treating MDO as your *only* line of defense; it’s a baseline, not a full security platform.” DeepSeek V4 Flash · negative prompt · soft negative
“Weak on standalone advanced threats—layer with others if needed.” Grok 4.1 Fast · direct prompt · soft negative
“should start with Microsoft Defender for Office 365 as the baseline and add IRONSCALES as a phishing-specific layer” DeepSeek V4 Flash · paraphrase prompt · first choice
“If you're already on Microsoft 365 → Microsoft Defender for Office 365 - Best value when bundled with M365 Business Premium” GLM 4.7 FlashX · paraphrase prompt · first choice
“The Industry Standard Alternatives... such as Microsoft Defender for Office 365, Proofpoint, Mimecast, or Netskope.” Qwen 3.7 Flash · negative 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.
“Proofpoint is priced and configured for enterprise environments with significant operational complexity... it just may not be suitable for smaller organizations.” Claude Haiku 4.5 · negative prompt · soft negative
“Traditional SEGs (like legacy Proofpoint or Mimecast setups) require rerouting your MX records, which is complex to manage and can disrupt mail flow.” Gemini 3.5 Flash · paraphrase prompt · soft negative
“priced and configured for enterprise environments with significant operational complexity and generally positioned above SMB budgets” Claude Haiku 4.5 · direct prompt · soft negative
“I'd suggest starting with Microsoft Defender for Office 365 if you're on M365, or Proofpoint Core Email Protection if you need more advanced features” MiniMax M2.5 · direct prompt · first choice
“look toward platforms that specialize exclusively in email security ... such as Microsoft Defender for Office 365, Proofpoint, Mimecast, or Netskope.” Qwen 3.7 Flash · negative prompt · first choice
“Proofpoint Essentials and Barracuda Email Protection are top recommendations due to their balance of advanced features, scalability, and value.” Mistral Small · direct prompt · first choice
Also compared
Comparisons are drawn for the top three products in each category. The output is the models' output; nothing here is a recommendation by the index.