Exchange Virtual Directory 404 Not Found

If anyone could help, it would be appreciated.
I have Windows SBS 2003 R2 Premium Edition. I had OMA, ActiveSync,
everything working fine and then suddenly one morning, it all stopped
working. The main cause that I have found is that when accessing:
http://servername/Exchange I receive a 404 not found error. Therefore
I cannot access OWA. However, I can access OWA when I login via
http://servername/Remote.
I have deleted and recreated the OWA virtual directories many times
and run the Internet Connection Wizard. All to no avail.
When accessing http://servername/OMA, I am asked for login details.
However, the eventlog gives the following error (in breif)
The remote server returned an error: (404) Not Found.
Source: Microsoft.Exchange.OMA.ExchangeDataProvider

http://servername/exchange - 404
http://servername/remote - fine
http://servername/oma - "A System error has occurred while processing
your request. Please try again. If the problem persists, contact your
administrator" event log 404.
http://servername/public - 404

If anyone has any ideas on how to tackle this, please let me know.
.

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