Exchange CAS crashes, users get 503 when accessing OWA… but ActiveSync works
TweetUpdated 9/18/2011: This happened to me again, see my latest post about this issue. Since migrating to Exchange 2010, every couple of weeks it looks like IIS crashes on the CAS. Going to the OWA URL in a browser would yield a 503 error. Strangely enough, ActiveSync worked fine (though Outlook Anywhere over HTTPS didn’t). [...]

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