E-commerce solution for AX 2009

Hi,

I have a small online retail client that use AX 2009 together with an internally developed e-commerce solution. They have asked me if there are any disadvantages with using AX 2009 together with e-commerce. I know that AX 2009 doesn't support retail but I know know how that affects e-commerce. So, what disadvantages could there be with using AX 2009 and e-commerce? What advantages could there be with a later version of AX?

Thanks!

Regards,

Helena