I found very strange trick where sometimes the integration is not working ang keep giving you error access your OMW server.
The trick is to either:
- Add the OMW server in the trusted zone in the internet explorer settings.
- Disable Internet Explorer Security Configuration. Tested 16th August 2010
By the way: I do not know what is the relation between the integration script and internet explorer settings, but I have done this step on different systems and it works.