AI for your Exchange Server On-Premises.
Postgate AI connects your Microsoft Exchange Server (on-premises and hybrid) to Claude, ChatGPT, Perplexity, Gemini, Mistral Vibe, and any MCP-capable AI assistant.
- Fully managed in Germany or self-hosted
- Per-user permissions
- Open standard (MCP)
Postgate AI teaser in 90 seconds – watch now
How Postgate AI connects Exchange On-Premises to AI assistants.
Microsoft 365 Copilot requires Exchange Online. For Exchange Server in your own data center, Microsoft doesn’t offer anything comparable. That’s exactly what Postgate AI was built for.
- Exchange Serveron your premises
- Postgate AIcentral MCP server, set up once
- AI assistantof your choice
Each user works in their own mailbox, with exactly the permissions they have in Outlook.
Optional add-on: a sidebar right inside OutlookEmail, calendar, contacts, and tasks: in chat, through agents, and in your own workflows.
AI chat
Your mailbox in plain language: ask, search, write, and schedule meetings, on desktop and mobile.
Autonomous agents
Agents that work 24/7: triage mail, draft replies, and flag follow-ups.
Any automation
Plug in your own workflows and agent platforms through the open MCP standard and automate whatever you need.
What you can do with it
Meeting times in seconds, no email back-and-forth
Just ask for a time that works for everyone. Postgate AI checks all attendees' calendars, suggests open slots, and sends the invite if you want.
Reply to Claude…
Your morning briefing, ready before your day begins
A daily summary of your mailbox: what's new, what matters, and who's been waiting days for a reply, with priority and subject line.
Ask anything
Remembers your out-of-office, before you do
The AI spots the vacation in your calendar with no out-of-office set, and proactively drafts a ready-to-use reply. One tap and it goes live.
The assistant works in Outlook, right next to the open email
The optional add-in opens a sidebar in classic Outlook for Windows and in Outlook for Mac. The assistant connects your question to the open email and works with your own permissions, including on Exchange on-premises.
More about the Outlook add-inHelen Ashcroft Quote for 40 seats - questions on term length
8:12 AMGood morning James,
Thank you for the quote you sent on Monday. We discussed it in our leadership meeting, and there are three points to resolve before procurement takes over:
1. You priced 40 seats. With the new site plan, we’re closer to 52, twelve of them in Leeds. How does that change the volume discount?
2. Procurement thinks a 36-month term is too long. Is 24 months possible, and how much more would that be per seat?
3. The works council wants to know where the data is stored and who can see it. A short written statement would help us a great deal.
Postgate AI
Mailbox assistant
Context: open email
Ask about your mailbox…
Built for Exchange On-Premises, with each employee’s own permissions.
For self-hosted Exchange
Connects your Exchange Server in your own data center, including hybrid environments. No cloud mailbox required.
Per-user permissions
Everyone keeps their existing Exchange permissions, unchanged. Each user’s access is personal and encrypted, and no one can see anyone else’s mailbox. No service account with access to all mailboxes, no master key.
Server-side, 24/7
Runs centrally on the server, even overnight and when your PC is off. For chat and automation.
Open standard (MCP)
Use any AI assistant you like. Claude today, ChatGPT tomorrow.
One central server, nothing to install on client machines.
Each customer gets a hardened, dedicated instance.
Delegated, isolated, encrypted
Delegation instead of impersonation, per-user encrypted vault, cross-user isolation.
Verified identity
OAuth 2.0 / PKCE, self-service onboarding via Microsoft sign-in.
Open integration
The MCP standard over Streamable HTTP, for any MCP-capable client with OAuth support, including Microsoft Copilot Studio and n8n as agent platforms.
Compliance
GDPR-compliant, DPA available.
Fully managed or on your own Windows Server.
Same mailbox tools either way. Setup, sign-in, and licensing differ.
Fully managed
A hardened, dedicated instance hosted in Germany, set up once and ready to go. We run, patch, and monitor the server for you.
See pricing →Self-hosted
Runs as a service on your own Windows server, inside your network. You keep your data and keys. Contact us for pricing.
More on self-hosted →AI helps with everything you do in Outlook and takes the busywork off your plate.
Mailbox
- Calendar
- Contacts
- Tasks
- Folders
- Search
- Attachments
- Shared mailboxes
- Bulk actions
AI assistance
- Rules
- Follow-ups
- Approvals
- Out of office
- Briefings
- Memory
- Writing style
Frequently asked questions
Does Copilot work with on-premises Exchange?
No. Microsoft 365 Copilot requires a mailbox in Exchange Online. For self-hosted Exchange Server (on-premises), Microsoft has only published an interest survey so far, not a product. Postgate AI fills exactly this gap, and it’s available today. You don’t need Microsoft 365 or a Copilot license. More on the "Microsoft Copilot & Exchange On-Premises" page.
Do our emails leave the company?
Yes, for processing: requests and responses pass through our server in Germany, GDPR-compliant, with a DPA. We act as a transparent proxy. By default, we don’t store or log mailbox content. We don’t run our own AI model. You decide which AI model processes your content. If you self-host Postgate AI, processing runs through your own server.
Why do I have to sign a data processing agreement (DPA)?
Because Postgate AI processes data from your mailboxes on your behalf, the GDPR (Art. 28) requires a data processing agreement (DPA) between you and us. Signing is part of sign-up and takes one click. Our subprocessors are listed in it.
Does every employee need new permissions?
No. Existing Exchange permissions apply, unchanged. No new permission model, no shared account.
Which Microsoft Exchange versions are supported?
Microsoft Exchange Server Subscription Edition (SE), Exchange 2019, and Exchange 2016 via EWS, including versions whose Microsoft support ended in October 2025. Hybrid environments are supported as well.
Can we install Postgate AI on our own server?
Yes. With a self-hosted license, it runs as a service on your own Windows server, inside your network. You keep your data and keys. Contact us for pricing, or read more on the "Self-hosted" page.
Which AI tools work with it?
Claude, ChatGPT, Perplexity, and Mistral Vibe are fully supported; Gemini via Gemini Enterprise or Google Antigravity; Microsoft Copilot Studio and n8n as agent platforms. Plus any MCP-capable client with OAuth support, including custom agents.
What is MCP?
The Model Context Protocol: an open standard that lets AI assistants securely access external systems such as your mailbox.
What does the 2026 EWS retirement mean for us?
It only affects Exchange Online. On-premises Exchange keeps EWS, exactly the interface Postgate AI connects through.
Want to see Postgate AI in action?
Try Postgate AI free for 14 days with your own mailbox. No credit card required, and it ends automatically.