OsCommerce is a reliably running, stable system with a great deal of available extensions and plugins. But it is an old system which does not contain appropriate cross-sell and up-sell options or promotional features. It is updated slowly, it is difficult to modify and lagging a bit behind when it comes to the latest solutions.
#1 OScommerce to Magento 2 Migration Provider
100% Uptime during re-platforming
4-6 Weeks Rapid Migration
Magento Certified Experts Support