Final answer:
You can remove an Azure resource group at any time, without the requirement of specific maintenance windows or notifying Microsoft support, but ensure no essential resources are lost by doing so.
Step-by-step explanation:
A resource group in Azure is a container that holds related resources for an Azure solution. The management of resource groups is quite flexible, and you can remove or delete a resource group at any time when it's no longer needed or required for the structure of your solution. There are no restrictions that limit the removal to specific maintenance windows, and there is no requirement to notify Microsoft support beforehand.
However, you should be cautious before deleting a resource group, as removing it will delete all the resources contained within that group. It is important to thoroughly check that the group does not contain any resources you want to retain. Additionally, you should ensure there are no dependencies that might be affected by the deletion of the resources within the group.