In preparation for an upcoming database migration -- converting a web site from a homegrown CMS to Drupal -- I've been spending a fair amount of time learning Drupal's Migrate module. Although I knew that Drupal 7 could connect to SQL Server, upon further scrutiny I found out that the sqlsrvr module requires the PHP SQL Server Driver 2.0 from Microsoft, a Windows-only driver. Since I work primarily on a Mac, I decided to first convert the SQL Server database to MySQL.