I just received the following e-mail from Yammer:
Yammer user lifecycle can now be managed from Office 365. Once Yammer Enterprise Activation is completed, user creation, deletion and restoration can be centralized in Office 365, and these actions are automatically reflected in Yammer. This new feature allows admins to have one place to manage the lifecycle of all their Office 365 users, including those who use Yammer. For example, Yammer administrators would notice that when Yammer users are deleted in Office 365, they are automatically deactivated (also known as ‘suspended’) in Yammer. These users will be shown as deactivated by ‘System Administrator’ and will also be included in the Export Users report. It is available now to all Yammer customers that use Office 365 sign in for Yammer.
For information on how to activate your network, please go to support.office.com and search for “Yammer Activation Guide.” For more details on the Yammer user lifecycle management from Office 365 click here.
Definitely good news!