Effective October 1, 2015, there are two data plan options for your Azure ExpressRoute service connections. Whether you currently use an Exchange provider or a network service provider, you can choose between unlimited or metered data plans based on your usage.
The unlimited data plan allows you to transfer an unlimited amount of data for a fixed monthly charge, and the metered plan is available for a small monthly connection fee with pay-as-you-go charges.
Current ExpressRoute customers with circuits created under the previous models are automatically mapped to a new plan when it helps save money. Some customers will save more by continuing with their current model for a longer period of time, in which case they’ll be mapped to a new plan at a later date.
For more information, please visit the ExpressRoute