ListQueues

The WSDL version you use for the request affects which queues are included in the response. Before the release of version 2008-01-01, you could use either of the available versions (2007-05-01 or 2006-04-01) for your ListQueues call and the response would include all your queues. If you're now using one or both of the old versions and the 2008-01-01 version to create queues, you can't get a list of all your queues with a single call to ListQueues. Instead, you must call twice: once using either the 2007-05-01 or 2006-04-01 version (which returns all queues you created with versions older than 2008-01-01), and once using the 2008-01-01 version (which returns only the queues created with the 2008-01-01 version). Note that queues created with the older versions are not compatible with the 2008-01-01 version, and vice versa.