In enterprise software sales, what is the responsibility of sales vs pre-sales personnel?

I work for VMware as pre-Sales consultant and here is my view and how it works @Vmware. Account Manager a.k.a Sales Rep is the person who will be incharge of any activities for a particular customer account. Mapping the right people in the account and managing the relationships are key responsibilities of an Account manager and also creating new leads by  understanding customer requirements & business model with outcomes . Account manager's vital skill is to be more strategical and aligns customer business goals to the company business goals. Technology consultant a.k.a Pre-Sales is the person who will be anchoring the opportunity along with Sales Rep. Pre-sales is the person who will Seed the solution to customer, qualify the lead, Presentations on New Products, Industry Trends, TCO/ROI, Roadmap discussions, Use-case gathering and converting them to Business outcomes to various audience ranging from Analyst/Admin till CXO , Proof of Concept and Demonstration of Solutions as per customer requirements, Creating Bill Of Materials for purchase. Apart from the above, the below are joint responsibilities. 1. Workshops. 2. Customer relationship management. Account manager and Technology Consultant go Hand-in-Hand and play a very crucial role in putting a strategy to achieve company goals/targets and help customer drive Business transformation aligning their goals. A Clear Strategy helps a succesfull Execution !