Hi TMLP
Network traffic inside Azure will NOT be charged, but for network traffic inbound and outbound you will be charged -
here this is written:
Data transfers measured in GB (transmissions to and from the Windows Azure datacenter): Data transfers are charged based on the total amount of data going in and out of the Azure services via the internet in a given billing period. Data
transfers within a sub region are free
For getting a feeling of pricing, please check the pricing calculator which I think does a good job, have a look
here.
HTH,
Marc