User import fails. What should I do?

If a user import fails with the error message “The Microsoft.ACE.OLEDB.12.0 provider is not registered on the local machine”, you need to:

Step 1: Install the 32-bit version of the Microsoft Access Database Engine.
Step 2: Ensure “Enable 32-Bit Applications” on the MeetingBooster application pool is set to True

Enable 32-Bit Applications