Try posting to an Exchange group as OWA is a part of Exchange, not Outlook.
microsoft.public.exchange.clients is a good place to start.

--
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, Steve T asked:

| When arranging a meeting using webmail clicking the 'availability'
| button results in a '503 Service unavailable' error. (in mozilla)
| When using IE you recieve a different error 'the service is no longer
| available'
|
| To my knowledge nothing has changed on the server and this
| functionality used to work, although I had never used it.
|
| we have a front end backend infrastructure and you reiceve this error
| what ever exchange server you go to, be it FE or BE.
|
| Anyones help would be appreciated