SAP S/4 HANA & ESS/MSS

Dear Team,

One of our client wants to go for SAP S4 HANA Enterprise Management 1511 FPS02 OnPremise. He is presently on ECC6 and have implemented ESS/MSS also on Enterprise Portal. He is now planning for migration onto SAP S/4 HANA. Following are my queries.

1. Once he is migrated to SAP S4 HANA, does he need Enterprise Portal again, if yes, what will be the possible landscape of the same.

2. If the client has to continue with Enterprise portal, does he need to upgrade his Netweaver portal. If yes, what is the most preferred version.

3. What would be the most preferred Go-To strategy if he has to continue with ESS/MSS.

Please provide me the responses for the above mentioned queries.

Thank You,

Sridhar R.