Scheduled Yammer downtime on May 16
Microsoft is scheduling Yammer downtime, and the service will be unavailable between noon to 4 PM on Saturday, May 16, 2015. During this four hour window, Yammer will be unavailable. Please plan accordingly.
The purpose of this downtime is to move Yammer into Microsoft managed datacenters.
This move is intended to bring increased capacity and compliance to Yammer, along with the full support of Microsoft Datacenter teams.