ZODBCDA strangeness

A developer using ZODBCDA with Vietnamese character-set wrote to me:

The ZODBCDA works on MS Access with Unicode but not MS SQL Server. On MS SQL Server, some characters in ntext field was not displayed correctly. Is this strange?

I’m a bit lazy and I don’t want to set up Vietnamese character set on my SQL Server, anyone else had any experience to share?

By the way, I’m aware of mxODBC, but I didn’t want to look at their sources so that a free alternative is available for those who need it.