A friendly reminder:
At Yammer we are committed to making our infrastructure more resilient and scaleable. To this end, on Saturday, March 30, 2013 from 10:00AM to 1:00PM PST, Yammer will be performing a major database upgrade which will require approximately 3 hours of downtime. All precautions have been taken to ensure downtime will be as minimal as possible and no customer data will be lost.
As always, we appreciate your patience!