As a follow up, some sites are using MySQL, some are using Access. None of them have had any changes made to their DSN, ODBC, etc. Worked fine until about 11 a.m. EST today
Yes, whatever was done fixed it. It would be nice to know what was done in case something like this happens in the future. It would eliminate a lot of explanation needed to get things resolved.
It is not always the same reason. However we always try to resolve issue from its root. Sorry for all inconveniences. ODBC service crashed on the server. Deepak is looking for reasons and will surely try his best to fix it.