What are the typical contract length terms? What happens to customers under contracts transacted via Azure Marketplace if we decide to delist from the marketplace?
Regarding contract terms for customers, it is important to know that contract lengths can vary from month-to-month and then 1-3 yearly contracts or terms which can be paid either monthly, yearly or once-off. If a customer cancels their subscription, they will be expected to lose access to the platform/solution and support. They will also not automatically get refunded and if a refund of some sort is applicable on your side, this will have to be logged with the Microsoft Billing team.
This article shows you how to make updates to existing offers and plans and how to remove an offer from the commercial marketplace - https://learn.microsoft.com/en-us/partner-center/marketplace/update-existing-offer#stop-distribution-of-an-offer-or-plan