# ICS feeds and Exchange EWS

Understand read-only feeds and the separate Hosted Exchange pilot.

Source: https://docs.getridian.com/integrations/ics-exchange/
Language: en
Reviewed: 2026-09-20

## ICS feeds

An ICS subscription is a read-only source. Ridian can synchronize a permitted representation into a writable destination. The feed cannot receive event writes, and an ICS connection is not an interactive AI calendar.

A feed URL may itself be a secret. Do not paste private subscription URLs into public tickets, screenshots or chat transcripts. Update freshness depends on what the source publishes and when the feed is fetched; it is not a real-time booking confirmation.

## Hosted Exchange through EWS

Hosted Exchange is a separate pilot path. A Microsoft 365 test account does not prove that a customer's Hosted Exchange endpoint, authentication and calendar permissions work. The customer connects the actual authorized account in production; customer data does not belong in a staging test.

Agree the endpoint, permitted account and isolated calendar with the administrator. Do not assume modern Microsoft OAuth setup and an EWS/basic-auth configuration are interchangeable. The provider may disable the required authentication method.

## Before committing to a workflow

Verify connection, calendar discovery, the intended read/write rights and a synthetic event lifecycle for the actual server. Keep the pilot scope explicit. An EWS sync pilot does not automatically establish every MCP or REST capability. Contact [support](https://docs.getridian.com/support/) with server type and the failed operation, without credentials.