The Office 365 descriptions are what I call the Bible of Office 365. This information can help any organization to learn about Office 365 and its services. You find information about many of the services at https://technet.microsoft.com/en-us/library/office-365-service-descriptions.aspx.

To learn more about each service, see its description:

• Office 365 Platform Service Description
• Office Applications Service Description
• Office Online Service Description
• Exchange Online Service Description
• Exchange Online Protection Service Description
• Exchange Online Advanced Threat Protection Service Description
• Exchange Online Archiving Service Description
• OneDrive for Business Service Description
• SharePoint Online Service Description
• Skype for Business Online Service Description
• Workplace Analytics Service Description
• Power BI Service Description
• Project Online Service Description
• Yammer Service Description
• Microsoft Dynamics 365 (online) Service Description

In these descriptions, you will find information such as the following:

• The SLA that the services have
• The limitations of your mailboxes
• How much storage space you have in SharePoint Online and OneDrive for Business
• What the limits are when sending emails with Exchange Online
• The difference between Office 365 plans