Up until now we have only had windows 7 pro clients connecting to our 2003 exchange server using Outlook 2010 email and public folder access with no problems. Today I have been attempting to get a Windows 10 pro client with it's built in email working with our exchange 2003 but I am seeing an error code 0x80090345.
I have also tried to use Outlook 2010 on the same windows 10 pro client, it automatically connects as a IMAP client where it can then poorly (piecemeal) search and show parts of our public folder store. When I try to get Outlook 2010 on Windows 10 Pro connected to our exchange 2003 then it fails with a message like "The connection to the Microsoft Exchange server is unavailable. Outlook must be online or connected to complete this action"
.... from what little I can determine online the 0x80090345 error and the msg "Microsoft Exchange Server is unavailable" may be the same error. Are they?
What can I do to resolve the problem?