His exit, which comes two years after the June 2012 acquisition of Yammer, follows standard timing. When companies are purchased, existing employees are often given two-year contracts, sometimes with earnouts attached. Sacks did his time, in other words.
Yammer didn’t warrant a mention in Microsoft’s most recent earnings report.
Microsoft has worked to move Yammer into its Office 365 lineup. If you visit the Yammer pricing page, you can purchase the service for $3 per user per month, but Microsoft lists two separate Office 365 options that both include Yammer.
In a statement concerning Sacks’ departure, Microsoft commented that Yammer is now used by “more than 500,000 organizations.”
Yammer was recently tossed into more Office 365 SKUs, making it available for no extra charge to new groups of people. As such, it seems that Microsoft is content to make Yammer component to Office 365, and use it as a lever to ratchet up subscribers of the latter service.