Wordpress and existing php site

[kingbal]

So a friend has tasked me with updating their site - they've got an existing standalone content management system which comprises of:

-simple blog
-multi-stage quote system
-worldpay integration

I want to move them onto Wordpress; how easy will it be to implement and plug in the existing functionality?

Obviously the blog can go but the quoting and payment system needs to stay and has its own backend to change products/prices etc.

I'm a c# developer and have only had limited experience with wordpress so please bear with me! Thanks

 

[kingbal]

I'll take a look at WP e-commerce and see if i can find a quotation system to match - the product itself is very simple and there are only a handful of variations.

Thanks for the replies guys.