Setting > Administration – Subscription Management/System notification/Resources in Use/Yammer Configuration

Subscription Management

This is Accessible to admin only – User having Security role as system administrator or System customizer.

Clicking here will open the Office Home page, where you can see all office app, Admin Centre where you can manage Subscription and billing of all users.
Dashboard where you can see All recent documents
Option to add new documents or upload
Option to install app on system

One drive and share point details.

System Notification

View notification related to Admin, If Subscription is Expiring or Need to buy licence or low with memory and so.

Resources in Use

This shows the name and url name of your organization.
CRM URL format is standard https://{URLNAME}.{CRMCountryWiseName}.dynamics.com/

Here you can see out 300 limit of creating custom Entity, how many is created so far.

Yammer Configuration
Yammer is a Private Social Networking site.
This application allow to share and communicate with other member of same organization only.
Member here are domain based.