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Event ID: 1801 Source: MSExchangeOMA

Source
Level
Description
Unable to connect to the Microsoft(R) Exchange server <server name>. To fix this problem, verify that there is network connectivity between this server and the Exchange server. Also, verify that the Exchange server that this server is attempting to connect to is functioning properly.
Comments
 
I had this error when running OMA test on a browser on the Exchange Server. The problem was that I used an IIS port other than port 80 for HTTP, and WebDAV did not know how to handle it. I added/reset port 80 back and it resolved this issue.
As per Microsoft: "This event indicates that the server in question is having a problem communicating with the Exchange server". See MSEX2K3DB for more details.

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