Microsoft to retire legacy Azure Service Bus .NET libraries on September 30, 2026

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Microsoft will retire the WindowsAzure.ServiceBus and Microsoft.Azure.ServiceBus .NET client libraries, along with the com.microsoft.azure.servicebus Java library, on September 30, 2026. On the same date, support for the SBMP protocol will end entirely, meaning apps using WindowsAzure.ServiceBus on default settings will stop connecting unless the connection string is updated to use AMQP. Microsoft.Azure.ServiceBus relies on AMQP and will continue to connect after the deadline, but will receive no further updates or security fixes. The recommended replacement is Azure.Messaging.ServiceBus, available since November 2020, which consolidates senders, receivers, and processors under a single ServiceBusClient entry point. Notably, use of WindowsAzure.ServiceBus for Azure WCF Relay remains supported and is unaffected by this retirement.

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