How to offer/sell custom solutions to existing Microsoft Customers

[bltechpro]

Hello,

I have developed a complete custom solution for Dynamics 365 and I'm wondering the followings:

1- How can I offer/sell it to existing Microsoft Customers using the Co-sell partner engagement  (AppSource and Marketplace)?

2- Has Microsoft ever purchased custom built solutions from external entities/partners?

Appreciate your comments-

Thanks,

[JanoschUlmer]

HI @bltechpro : I would recommend to start here for question 1: Co-sell partner engagement - Microsoft commercial marketplace | Microsoft Docs 

For question 2 - I guess so, but maybe you can elaborate why you are asking the question? Co-Sell means selling to end customers, supported by Microsoft field sellers. This has nothing to do with selling to Microsoft.