On September 30, 2026, the Azure Service Bus team will retire support for the Service Bus Messaging Protocol (SBMP). This is important BizTalk Server 2020 customers who use the BizTalk Service Bus (SB-Messaging) adapter, as SBMP is the protocol that adapter relies on today. To help customers maintain continuity while planning their transition to Azure Logic Apps, we’ve released a BizTalk Server 2020 hotfix that adds support for Advanced Message Queuing Protocol (AMQP) in the adapter. What’s changing SBMP support retires on September 30, 2026 in Azure Service Bus. A hotfix enables AMQP for the BizTalk Service Bus (SB-Messaging) adapter (request KB5091375 opening a support case). AMQP becomes the default transport with the hotfix installed, while SBMP remains available as an opt-in fallback for backward compatibility. The hotfix will be available for BizTalk Server 2020 CU6 and CU7. The current hotfix is based on the current Service Bus SDK (scheduled for deprecation in September 2026), and we expect an updated version in June based on the new Service Bus SDK. What you need to do If you plan to continue using the BizTalk Server 2020 Service Bus adapter, you should: Migrate your adapter configuration to AMQP . Install the hotfix well before September 2026, and run validation in a non-production environment. Validate your scenarios , including large message/file patterns and any operational fallback strategies you depend on. Decide whether to test now or wait for the June update : use the current hotfix to validate large file scenarios and fallback approaches, or wait for the June SDK-based refresh if you don’t need to install immediately. How to obtain the hotfix You can obtain the hotfix by opening a support case (request KB5091375 ) or by contacting your Microsoft account team. The hotfix enables AMQP support for the BizTalk Service Bus (SB-Messaging) adapter. A new KB article will be issued for the June update. Support and lifecycle context Microsoft remains committed to supporting BizTalk Server 2020 and its features in accordance with the official product lifecycle. Extended paid support will be available after April 2028. Closing thoughts If you’re using the SB-Messaging adapter today, now is the right time to plan your move to AMQP and schedule validation in a non-production environment. This keeps you ahead of the September 2026 retirement date and helps ensure a smooth path as you modernize toward Azure Logic Apps.