Brian Swan has a new post about the just-released support Microsoft has built in to their SQL Server drivers to allow it to fully support PDO.
Add SQL Server to the list of databases with PDO support! Today, the SQL Server Driver for PHP team released the SQL Server Driver for PHP 2.0 CTP, which includes support for PHP Data Objects (PDO). The announcement of the release came during the opening keynote speech at DrupalCon 2010?.
Read more on Josh Holmes' blog