There is a MySQL module available for PHP, but it’s not likely to be established by way of default. You ought to ask your host to configure your PHP to include it so you can talk to the MS SQL Server from PHP. That lets in you to get the statistics, however, WooCommerce will have no idea a way to handle such information, it’s built around WP put up sorts. You could need a completely customized fork of WC that is rewritten to apply MS Server and whatever information schema your POS makes use of. It could come to be being a chief coding undertaking.