diff --git a/docker/client/Dockerfile b/docker/client/Dockerfile
index 8942f578e..c2c291b78 100644
--- a/docker/client/Dockerfile
+++ b/docker/client/Dockerfile
@@ -28,6 +28,10 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY requirements-webapp.txt ./
 RUN pip install --no-cache-dir -r requirements-webapp.txt
 
+# Integration test dependencies (only needed when using AzureIoc)
+COPY requirements-integration.txt ./
+RUN pip install --no-cache-dir -r requirements-integration.txt
+
 ENV OPWEN_SESSION_KEY=changeme
 ENV OPWEN_SETTINGS=/app/docker/client/webapp.env
 
@@ -56,9 +60,13 @@ RUN apt-get update \
 
 # hadolint ignore=DL3010
 COPY --from=compiler /app/dist/pkg.tar.gz /app/dist/pkg.tar.gz
+COPY --from=compiler /app/requirements-integration.txt /app/requirements-integration.txt
 
+# Install without [opwen_email_server] extra to avoid server dependencies (libcloud 3.2.0)
+# Client only needs base package with requirements-webapp.txt (libcloud 3.8.0)
 # hadolint ignore=DL3013
-RUN pip install --no-cache-dir "/app/dist/pkg.tar.gz[opwen_email_server]" \
+RUN pip install --no-cache-dir "/app/dist/pkg.tar.gz" \
+ && pip install --no-cache-dir -r /app/requirements-integration.txt \
  && rm -rf /tmp/pip-ephem-wheel-cache*
 
 COPY --from=compiler /app/docker/client/run-*.sh /app/docker/client/
diff --git a/opwen_email_server/integration/celery.py b/opwen_email_server/integration/celery.py
index b9d2849fc..fb214ea15 100644
--- a/opwen_email_server/integration/celery.py
+++ b/opwen_email_server/integration/celery.py
@@ -1,4 +1,6 @@
 from celery import Celery
+from kombu import Exchange
+from kombu import Queue
 
 from opwen_email_server import config
 from opwen_email_server.actions import IndexReceivedEmailForMailbox
@@ -121,6 +123,29 @@ def _fqn(task):
     return f'{__name__}.{task.__name__}'
 
 
+# RabbitMQ 4.0+ deprecated transient non-exclusive queues
+# Explicitly define all queues as durable
+default_exchange = Exchange('celery', type='direct', durable=True)
+
+task_queues = (
+    Queue(config.REGISTER_CLIENT_QUEUE,
+          exchange=default_exchange,
+          routing_key=config.REGISTER_CLIENT_QUEUE,
+          durable=True),
+    Queue(config.MAILBOX_RECEIVED_QUEUE,
+          exchange=default_exchange,
+          routing_key=config.MAILBOX_RECEIVED_QUEUE,
+          durable=True),
+    Queue(config.MAILBOX_SENT_QUEUE, exchange=default_exchange, routing_key=config.MAILBOX_SENT_QUEUE, durable=True),
+    Queue(config.PROCESS_SERVICE_QUEUE,
+          exchange=default_exchange,
+          routing_key=config.PROCESS_SERVICE_QUEUE,
+          durable=True),
+    Queue(config.INBOUND_STORE_QUEUE, exchange=default_exchange, routing_key=config.INBOUND_STORE_QUEUE, durable=True),
+    Queue(config.WRITTEN_STORE_QUEUE, exchange=default_exchange, routing_key=config.WRITTEN_STORE_QUEUE, durable=True),
+    Queue(config.SEND_QUEUE, exchange=default_exchange, routing_key=config.SEND_QUEUE, durable=True),
+)
+
 task_routes = {
     _fqn(register_client): {'queue': config.REGISTER_CLIENT_QUEUE},
     _fqn(index_received_email_for_mailbox): {'queue': config.MAILBOX_RECEIVED_QUEUE},
@@ -131,7 +156,16 @@ def _fqn(task):
     _fqn(send): {'queue': config.SEND_QUEUE}
 }
 
-celery.conf.update(task_routes=task_routes)
+celery.conf.update(
+    task_queues=task_queues,
+    task_routes=task_routes,
+    # RabbitMQ 4.0+ deprecated transient non-exclusive queues
+    # Disable remote control to avoid creating non-durable pidbox queues
+    worker_enable_remote_control=False,
+    # RabbitMQ 4.0+ deprecated global_qos feature
+    # Use per-consumer prefetch instead of global QoS
+    worker_prefetch_multiplier=1,
+)
 
 if __name__ == '__main__':
     celery.start()
diff --git a/requirements-integration.txt b/requirements-integration.txt
new file mode 100644
index 000000000..09f5aebe0
--- /dev/null
+++ b/requirements-integration.txt
@@ -0,0 +1,15 @@
+# Additional dependencies required for integration testing with AzureIoc
+# These are server-side dependencies imported by opwen_email_server.integration.webapp.AzureIoc
+# Only needed when LOKOLE_IOC=opwen_email_server.integration.webapp.AzureIoc (integration tests)
+# Production client uses opwen_email_client.webapp.ioc.Ioc which doesn't need these
+
+applicationinsights==0.11.10  # Required by opwen_email_server.utils.log
+msgpack==1.0.4  # Required by opwen_email_server.utils.serialization
+python-http-client==3.3.7  # Required by sendgrid
+sendgrid==6.9.7  # Required by opwen_email_server.integration.celery.send_and_index_email
+pyzmail36==1.0.5  # Required by opwen_email_server email parsing
+azure-servicebus==7.8.0  # Required by opwen_email_server.services.queue
+connexion[swagger-ui]==2.14.0  # Required by opwen_email_server API
+jsonschema==4.23.0  # Required by connexion
+referencing==0.35.1  # Required by jsonschema
+wikipedia==1.4.0  # Required by opwen_email_server.services.index
diff --git a/requirements-webapp.txt b/requirements-webapp.txt
index bd09e9e0e..b649a1125 100644
--- a/requirements-webapp.txt
+++ b/requirements-webapp.txt
@@ -1,4 +1,4 @@
-setuptools>=65.5.0,<73.0.0  # Required for pkg_resources in Python 3.12+ (no longer included by default). Upper bound because setuptools 73+ removed pkg_resources
+setuptools>=65.5.0,<73.0.0  # Required for pkg_resources in Python 3.12+ (setuptools 73+ removed it)
 Babel==2.14.0  # 2.14.0+ required for Python 3.13 (removed cgi module dependency)
 Flask-BabelEx==0.9.4
 pytz  # Required by Flask-BabelEx (no longer a transitive dep of Babel 2.14+)
@@ -16,7 +16,7 @@ WTForms==3.0.1
 email-validator==1.2.1
 Werkzeug==2.2.1
 fasteners==0.17.3
-apache-libcloud==3.8.0
+apache-libcloud==3.8.0  # Client: Python 3.12 support. Overrides base 3.2.0. Azure Storage only.
 bcrypt==4.0.1
 beautifulsoup4==4.11.1
 cached-property==1.5.2
diff --git a/requirements.txt b/requirements.txt
index d98b8e686..c5e315939 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Flask==2.2.1
 Flask-Cors==3.0.10
 Pillow==10.4.0  # 10.1.0+ required for Python 3.13 support
 setuptools>=65.5.0,<73.0.0  # Required for pkg_resources (gunicorn dependency). setuptools 73+ removed pkg_resources
-apache-libcloud==3.8.0
+apache-libcloud==3.2.0  # Server: Python 3.9, stable Cloudflare DNS. Client overrides to 3.8.0 (Python 3.12).
 applicationinsights==0.11.10
 beautifulsoup4==4.11.1
 cached-property==1.5.2
diff --git a/tests/opwen_email_server/integration/test_celery.py b/tests/opwen_email_server/integration/test_celery.py
index e39f8415c..3d31b9b86 100644
--- a/tests/opwen_email_server/integration/test_celery.py
+++ b/tests/opwen_email_server/integration/test_celery.py
@@ -25,7 +25,7 @@ def exchange(self) -> Exchange:
 
     @cached_property
     def queue(self) -> Queue:
-        return Queue(self.queue_name, exchange=self.exchange, routing_key=self.routing_key)
+        return Queue(self.queue_name, exchange=self.exchange, routing_key=self.routing_key, durable=True)
 
     @skipUnless(QUEUE_BROKER, 'no celery broker configured')
     def test_send_message(self):