We have a situation where we have both, our in-house Exchange server and Office 365. I need to search from email address, whether the account exists on in-house server or Office 365. How can we do it through EWS?
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Autodiscover will return the correct endpoints to access a given mailbox provided that you've configured it correctly for a hybrid environment. I haven't done this myself but there should be documentation online.

Richard Fuller
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