In the example below, 2 is the family, 12 is the version and "rel2" is the release.

Guest OS release - 2.12 rel2 Configuration string for this release - WA-GUEST-OS-2.12_201208-02 The configuration string for a Guest OS has this same information embedded in it, along with a date showing which MSRC patches were considered for that release.

updating to os 4 5-56updating to os 4 5-49

You can read more about the retirement policy here.

The Guest OS families are based on released versions of Microsoft Windows Server.

The Guest OS is the underlying operating system that Azure Cloud Services run on.

Each Guest OS has a family, version and release number.

If you configure your roles to use Unsure about what the Guest OS is or how the Guest OS releases work? December Guest OS rollout is starting December 14 2016, and projected to be released on January 13 2016.

November Guest OS rollout is starting November 8 2016, and projected to be released on December 8 2016.March Guest OS rollout is starting March 14 2016, and projected to be released on April 8 2016.February Guest OS rollout is starting February 22 2016, and projected to be released on March 9 2016.Windows Server 2016 will be released as OS Family 5 on November 1 2016, with . September Guest OS rollout is starting September 13 2016, and projected to be released on October 13 2016.August Guest OS rollout is starting August 9 2016, and projected to be released on September 8 2016.January Guest OS rollout is starting January 18 2016, and projected to be released on February 12 2016.