I do understand it’s not supported by WP community ??
But I have a few sites built using MS SQL on MS IIS that I need to support until I can move them to new platform.
I also found the problem with special characters and it was related to 4.2.2 and not MS SQL and ProjectNami.
In wp-db.php I found that the charset needs to be utf8mb4 to fully support UTF-8 character sets. By changning the wp-option DB_CHARSET and the dbo.wp_option blog_charset to utf8mb4 instead of just UTF-8 it all started working ?? Will cross-post the fix to the ProjectNami on GitHub as well.