Recenly migrated accounts to a new excahnge server, and when users are launching outlook it is not coming up. Can ping the IP, but not the DNS. When adding the new server name into Outlook, it recognizes the name and is underlined. Still does not open. Gives default folders option, but will not open inbox. Try putting in IP address instead of server name, and when hitting "check name", recognizes, but reverts the server name back to DNS.
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