Disable Yammer in Office 365 removes Yammer from all users, a social network that Microsoft added to Office 365.
Microsoft surprised Office 365 admins announcing that Microsoft would automatically activate Yammer on every new and existing tenant. Compared to most Office 365 services like Exchange, SharePoint and Skype for Business, enterprises didn't always want to add a social network for their users. Furthermore, since Yammer is currently only hosted in the United States, some enterprises don't want their data hosted in the US for multiple reasons.
Disable Yammer in Office 365 is a PowerShell script that will disable Yammer licenses for all your users so you don't have to do it by hand. This script will loop trough all your licensed users, and disable Yammer. The Script supports different SKU for each user, so if your users will be assigned the same license, but without Yammer inside. Make sure you are connected to Office 365 before running the script as I didn't include that part! If you don't know how to connect to Office 365, check out the tutorial on the PowerShell Portal. You might also be interested in learning more about PowerShell for Office 365 to better understand the script, and be able to make your own.
NOTE: If you have an EDU tenant, you will need to change "YAMMER_ENTERPRISE" to "YAMMER_EDU".
Disable Yammer in Office 365 uses Microsoft PowerShell. Here is a tutorial on using PowerShell if you're new to it: