# Google Vault vs MailStore Server: which do AI models recommend for comms archiving, October 2026

IT AI Recommendation Index, October 2026 Edition, Communications archiving and compliance. Zero of fourteen models named Google Vault first on the direct prompt; one named MailStore Server. Page: https://it-ai-index.com/security/communications-archiving-and-compliance/google-vault-vs-mailstore-server/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Google Vault | 8% | #4 of 12 | 18% | 17 | 11 of 14 |
| MailStore Server | 7% | #6 of 12 | 0% | 13 | 7 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)
- Claude Haiku 4.5: neither first, one named (first choices: Mimecast Cloud Archive, Smarsh Enterprise Archive) (alternatives: Arcserve UDP Archiving, ComplyKEY MailMeter, MailStore Server)
- GPT-5.4 mini: neither named (first choices: Smarsh Enterprise Archive) (alternatives: Archive360, Microsoft Purview, Mimecast Cloud Archive, Theta Lake)
- Gemini 3.5 Flash: neither named (first choices: Mimecast Cloud Archive) (alternatives: Barracuda Cloud Archiving Service, 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)
- Mistral Small: neither named (first choices: Mimecast Cloud Archive, Smarsh Enterprise Archive) (alternatives: Microsoft Purview, Proofpoint Enterprise Archive)
- DeepSeek V4 Flash: neither named (first choices: Jatheon) (alternatives: Mimecast Cloud Archive, Proofpoint Enterprise Archive)
- Llama 4 Maverick: neither named
- Qwen 3.7 Flash: neither named (first choices: Mimecast Cloud Archive, Proofpoint Enterprise Archive) (alternatives: Global Relay, OpenText, Smarsh Enterprise Archive, Wordwatch)
- GLM 4.7 FlashX: neither named (first choices: Global Relay, Smarsh Enterprise Archive) (alternatives: Mimecast Cloud Archive, Theta Lake, Wordwatch)
- MiniMax M2.5: neither named (first choices: Global Relay, Smarsh Enterprise Archive) (alternatives: Mimecast Cloud Archive, Proofpoint Enterprise Archive, Theta Lake)
- GPT-6 Luna: neither named (first choices: Mimecast Cloud Archive) (alternatives: Global Relay, Microsoft Purview, Proofpoint Enterprise Archive, Smarsh Enterprise Archive)
- 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 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)

## 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)

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.