Professional support
Here is a list of companies which can provide you some support on James.
Linagora
Linagora is an Open Source Software Company.
Their mission is to bring digital independency to their customers.
They are focused on large organizations both from private and public sector. They have set themselves the goal of helping Governments to achieve their digital sovereignty.
Linagora can offer professional services related to James: support, feature development or project integration.