Why Exchange Server is Unavailable in Outlook 2007/2010

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At the time I attempt to link Microsoft Outlook 2007 or 2010 to Microsoft Exchange Server, I see the 'exchange server unavailable' error.  Why this?

Connecting To Microsoft Exchange Server

Your Microsoft Exchange Server is unavailable.

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Answered By 0 points N/A #197973

Why Exchange Server is Unavailable in Outlook 2007/2010


This problem could be occurred if you client computer doesn’t have the configuration of a default gateway. You have to add the DWORD value in the DEfConnectOpts registry.

In Outlook 10:

  1. Start-Run-Type regedit and press Enter.
  2. Locate the following key and click the subkey:


  1. Select New from the edit Menu and click DWORD value.
  2. Then Type DefConnectOpts and press Enter.
  3. Right click DefConnectOpts and click Modify.
  4. Type 0 in the value data box and click OK.
  5. Exit Registry Editor.

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