Hello! Welcome to the Feng Forums!
I would suggest going for the 2.5.1.2 and try installing the email module again as it seems like the 2.5.1.1 version had an issue when creating the MySQL structure.
Otherwise you could look for the missing column in the source code, get the SQL statement that creates it, and run it in your Feng Office installation.
Hope you find this information useful.
Best regards,
Francisco