Active Sync – Unexpected Exchange mailbox Server (Exchange 2003)

Unexpected Exchange mailbox Server error: Server: [server01.XXXX.XX] User: [[email protected]] HTTP status code: [503]. Verify that the Exchange mailbox Server is working correctly.

If you got this error, please follow this steps:

  1. Try disabling the firewall
  2. Reset Exchange Folder in IIS – (Dont remove exchange-oma)
  3. Remove Exchange-oma and create it again
  4. Remove IPV6 from the server

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