Does the Azure subscription expire ?

No. Pay-As-You-Go subscription do not have an expiration period. All subscription and its content are expected to comply the Cloud licensing terms in terms of usage. A free trial signed by a customer expires in 30 days after which it is expected to be upgraded to a Pay-As-You-Go account / Subscription . rhipe offers free migration services to move non CSP subscriptions to CSP subscription. Partners can choose to switch to a CSP services model with great ease. Refer to our migration page here for more details.

Azure offer a set of free resources within active subscription. Refer to the list of free resources here