# MailStore Server vs Proofpoint Enterprise Archive: which do AI models recommend for comms archiving, October 2026

IT AI Recommendation Index, October 2026 Edition, Communications archiving and compliance. One of fourteen models named MailStore Server first on the direct prompt; one named Proofpoint Enterprise Archive. Page: https://it-ai-index.com/security/communications-archiving-and-compliance/mailstore-server-vs-proofpoint-enterprise-archive/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| MailStore Server | 7% | #6 of 12 | 0% | 13 | 7 of 14 |
| Proofpoint Enterprise Archive | 5% | #8 of 12 | 5% | 39 | 14 of 14 |

## The direct prompt, model by model

- Kimi K2: mailstore server first (first choices: Barracuda Cloud Archiving Service, MailStore Server) (alternatives: Jatheon, Mimecast Cloud Archive, Smarsh Enterprise Archive)
- Qwen 3.7 Flash: proofpoint enterprise archive first (first choices: Mimecast Cloud Archive, Proofpoint Enterprise Archive) (alternatives: Global Relay, OpenText, Smarsh Enterprise Archive, Wordwatch)
- Claude Haiku 4.5: neither first, one named (first choices: Mimecast Cloud Archive, Smarsh Enterprise Archive) (alternatives: Arcserve UDP Archiving, ComplyKEY MailMeter, MailStore Server)
- Gemini 3.5 Flash: neither first, one named (first choices: Mimecast Cloud Archive) (alternatives: Barracuda Cloud Archiving Service, Proofpoint Enterprise Archive, Theta Lake)
- Mistral Small: neither first, one named (first choices: Mimecast Cloud Archive, Smarsh Enterprise Archive) (alternatives: Microsoft Purview, Proofpoint Enterprise Archive)
- DeepSeek V4 Flash: neither first, one named (first choices: Jatheon) (alternatives: Mimecast Cloud Archive, Proofpoint Enterprise Archive)
- MiniMax M2.5: neither first, one named (first choices: Global Relay, Smarsh Enterprise Archive) (alternatives: Mimecast Cloud Archive, Proofpoint Enterprise Archive, Theta Lake)
- GPT-6 Luna: neither first, one named (first choices: Mimecast Cloud Archive) (alternatives: Global Relay, Microsoft Purview, Proofpoint Enterprise Archive, Smarsh Enterprise Archive)
- Muse Glimmer 30B: neither first, one named (first choices: Barracuda Archiving Service / Barracuda Cloud Archiving Service) (alternatives: Global Relay, Proofpoint Enterprise Archive, Smarsh Enterprise Archive, Wordwatch)
- GPT-5.4 mini: neither named (first choices: Smarsh Enterprise Archive) (alternatives: Archive360, Microsoft Purview, Mimecast Cloud Archive, Theta Lake)
- Perplexity Sonar: neither named (first choices: Smarsh Enterprise Archive) (alternatives: Global Relay, Mimecast Archiving, Wordwatch)
- Grok 4.1 Fast: neither named (first choices: Smarsh Enterprise Archive) (alternatives: Global Relay, Jatheon)
- Llama 4 Maverick: neither named
- GLM 4.7 FlashX: neither named (first choices: Global Relay, Smarsh Enterprise Archive) (alternatives: Mimecast Cloud Archive, Theta Lake, Wordwatch)

## What the models said about MailStore Server

- "1-5 users, on-prem, minimal spend: MailStore Server Starter Kit at $259 one-time ... is the cheapest proven option." (Muse Glimmer 30B, budget prompt, first choice)
- "For the tightest budget, start with MailStore Server (if you can handle on-premises) or Google Vault" (MiniMax M2.5, budget prompt, first choice)
- "Start with Barracuda or MailStore if your needs are primarily email compliance and eDiscovery." (Kimi K2, direct prompt, first choice)

## What the models said about Proofpoint Enterprise Archive

- "Proofpoint is an excellent enterprise-grade tool, but it may require more dedicated administrative overhead" (Gemini 3.5 Flash, negative prompt, soft negative)
- "Cons: May be overkill for smaller mid-sized companies" (Kimi K2, paraphrase prompt, soft negative)
- "Proofpoint if you want a modern cloud-first archive with strong governance for mainstream business communications." (Perplexity Sonar, paraphrase prompt, first choice)
- "Proofpoint (Leader in 2024 Gartner MQ for Digital Communications Governance & Archiving; longest-running leader)." (Grok 4.1 Fast, comparative prompt, first choice)
- "Regulated Industries: Smarsh and Proofpoint lead for financial services and strict compliance." (Mistral Small, comparative prompt, first choice)

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. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.