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Active Sync Error EventID 3005 Unexpected Exchange Mailbox Server Error

Steven Marks
Steven Marks
01 Feb 2012 · 1 min read
Heads up — this article is over 174 months old. Some of the details may have changed since it was written.

One of our customers was getting the below error and it took ages to find a solution so I thought I would post it here.

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Unexpected Exchange mailbox Server error: Server: [server.domain] User: [useremail] HTTP status code: [503]. Verify that the Exchange mailbox Server is working correctly.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

This is how I fixed the issue:

  1. Open IIS
  2. Right click Default-Website
  3. Click Properties
  4. Click advanced
  5. Review sites. most likely you will see host headers and ip address.
  6. Click add
  7. IP address = (all unassigned)
  8. TCP Port = 80
  9. Host Header Value = (Blank)
  10. Click OK
  11. delete the entry with the host headers and ip address assignerd.

This should resolve the issue please comment if you have any issues doing this.

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