The problem is likely occuring because ipMonitor is attempting to impersonate the account on the development domain, which is not possible because one cannot impersonate an account on a domain other than the one you are in. To work around this, open the Credential you are trying to use by going to "Configuration -> Credential List" and selecting the following option and deselecting everything else:
-May be used with NTLM Authentication Schemes (Windows NT Lan Manager)
Once this is done, try rescaning the exchange server using this modified credential and see if it finds additional resources.
Let me know.
Chris Foley | Support Specialist
SolarWinds | IT Management, Inspired By You
Support:866.530.8040 || Fax:512.857.0125