# Mimecast Cloud Archive vs Google Vault: which do AI models recommend for comms archiving, October 2026

IT AI Recommendation Index, October 2026 Edition, Communications archiving and compliance. Five of fourteen models named Mimecast Cloud Archive first on the direct prompt; zero named Google Vault. Page: https://it-ai-index.com/security/communications-archiving-and-compliance/mimecast-cloud-archive-vs-google-vault/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Mimecast Cloud Archive | 17% | #2 of 12 | 11% | 36 | 12 of 14 |
| Google Vault | 8% | #4 of 12 | 18% | 17 | 11 of 14 |

## The direct prompt, model by model

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

## What the models said about Mimecast Cloud Archive

- "Include Mimecast in the shortlist. Its archive product covers email and collaboration data, but check that its capture and review capabilities match your actual channels" (GPT-6 Luna, paraphrase prompt, soft negative)
- "Mimecast remains a powerful tool, but if you choose to use it, you must carefully vet their security protocols" (Gemini 3.5 Flash, negative prompt, soft negative)
- "its archiving solution can be complex to set up and may require significant administrative overhead" (Mistral Small, negative prompt, soft negative)
- "Jatheon or Mimecast — Jatheon offers excellent multi-channel coverage at competitive pricing for mid-market, while Mimecast provides a robust consolidated platform" (Kimi K2, paraphrase prompt, first choice)
- "For a true mid-market B2B company, Mimecast or Smarsh Professional Archive tend to offer the best balance of features, scalability, and cost-effectiveness." (Claude Haiku 4.5, direct prompt, first choice)
- "1#1: Mimecast - Cloud-based email archiving solution with advanced search, eDiscovery, and compliance retention policies." (Muse Glimmer 30B, paraphrase prompt, first choice)

## What the models said about Google Vault

- "built-in tools like Microsoft 365 retention, Google Vault, and Slack’s native archive are repeatedly described as insufficient for full compliance" (Perplexity Sonar, negative prompt, soft negative)
- "Limitation: Less robust than dedicated platforms for regulated industries" (Kimi K2, comparative prompt, soft negative)
- "Google Vault will not easily archive MS Teams" (Gemini 3.5 Flash, paraphrase prompt, soft negative)
- "start with MailStore Server (if you can handle on-premises) or Google Vault (if already using Google Workspace)" (MiniMax M2.5, budget prompt, first choice)
- "Google Vault stands out as the best communications archiving platform for a company with a limited budget" (Grok 4.1 Fast, budget prompt, first choice)
- "Google Vault is often recommended as a cost-effective communications archiving solution" (Mistral Small, budget 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.