I'm getting this error daily:
Event Type: Warning
Event Source: CiscoUnity_MALEx
Event Category: Warning
Event ID: 30019
Time: 6:31:51 PM
The MAPI subsystem has indicated that the Global Catalog Server
dfwsrv1.ad.corp.expertcity.com which is used to resolve addresses for message submission cannot be reached, and that it has switched to using Global Catalog server dfwsrv1.ad.corp.expertcity.com. Unity will continue to function using this newly selected Global Catalog server and will not automatically switch back to the original one. If Unity does not have a dedicated connection with sufficient bandwidth to the newly selected server, then there may be significant delays in Exchange access by Unity. Please verify that Unity has a good connection to the new Global Catalog for proper functioning.
My unity box seems to be functioning perfectly well otherwise. I'm not sure why it is looking to that server as a global catalog server. From the DCGC reconnect toll as well as DOHPropTest, it is looking at a different Domain Controller and Global Catalog server.