I have been told that Unity 3.1 does not support Multi-Tenant, if so:
What does the CCM service parameter "MultiTenantMWIMode" do ?, by reading the definition it states if you set this to true that you can use translation patterns to activate the MWI.
If this is the case then MWI should be able to work in Multi-Tenant mode, or is there a problem with this feature.