Developer builds private AI assistant for Microsoft 365 that keeps data in-tenant

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A developer has built Privault, an AI knowledge assistant that runs entirely within a company's own Microsoft 365 Azure tenant, ensuring no data leaves the client's infrastructure. The tool is aimed at document-heavy organisations such as construction and engineering firms with 50 or more knowledge workers, particularly EU small and medium businesses concerned about data residency and per-seat pricing. Privault uses Microsoft Graph to index SharePoint documents and supports semantic search, email drafting, task creation, and calendar access, with all responses cited for auditability. The system supports over 90 languages and uses Anthropic's language model under a zero-data-retention agreement. The developer notes that the biggest technical challenge was not building the retrieval system itself, but reliably grounding answers with citations under real-world conditions such as bilingual queries and contradictory source documents.

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