The key features for 4.x versions of X-Cart

Supported features:

Improved categories management mechanism (unlimited categories)
Inventory tracking based on product options
Ability to sort out products on the customer storefront
Support HTML
HTML-format for e-mail notifications turned on by default
Flexible tax management system
Fully multilingual interface, including admin/provider part
New integrated ‘Manufacturers’ module enabling you to classify your products by the brand names
New integrated ‘News Management’ module enabling you to have multiple news lists for your customers
Additional options enabling you to optimize your e-store for search engines
Customizable product search form, extended set of search fields
Simultaneous editing of multiple products
Ability to edit the options of a product contained in the shopping cart

Unsupported features: