Microsoft 365 Licenses Explained: Part 1

Understanding Business Essentials From Exchange Online to Business Premium

Microsoft 365 licensing can feel overwhelming at first. With so many plans, add-ons, and feature sets, it’s easy to wonder which one actually fits your business. This guide walks you through the foundational licenses that most small and mid-sized businesses start with. Each plan builds on the one before it, adding capabilities as your team grows and your needs evolve.

The Foundation Plans#

These are the core licenses designed for businesses with up to 300 users. They range from basic email to full productivity suites with security included.

Exchange Online Plan 1 (~$4/user/mo)#

This is your starting point if all you need is professional email hosting. It gives you a mailbox with your own domain, calendar, and contacts, but nothing beyond that. There are no Office apps, no file storage beyond what’s in your mailbox, and no collaboration tools.

What’s included:

• 50 GB mailbox per user
• Custom email domain (yourname@yourcompany.com)
• Calendar and contacts
• Outlook on the web access

Best for: Organizations that only need email and calendar, or those already using Google Workspace or another platform for documents and collaboration.

Microsoft 365 Business Basic (~$6/user/mo)#

This plan includes everything from Exchange Online Plan 1, but adds the web and mobile versions of Office apps plus cloud storage and collaboration tools. You can’t install Office on your desktop, but you can use Word, Excel, and PowerPoint through your browser and edit files from anywhere.

What’s included:

• Exchange Online (50 GB mailbox)
• OneDrive for Business (1 TB storage per user)
• SharePoint Online for team sites
• Microsoft Teams for chat and meetings
• Office apps (web and mobile only — no desktop installs)

Best for: Teams that work mostly online or on mobile devices and don’t need desktop Office apps. Perfect for startups, remote workers, or budget-conscious teams.

Microsoft 365 Business Standard (~$12.50/user/mo)#

This is where most businesses land. It includes everything from Business Basic, but now you get full desktop versions of Word, Excel, PowerPoint, Outlook, and the rest of the Office suite. You can install them on up to five devices per user (PC, Mac, or mobile). This is the first plan that gives you a complete productivity experience.

What’s included:

• Everything in Business Basic
• Full Office desktop apps (Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access)
• Install on up to 5 devices per user
• Outlook desktop client for email management
• Advanced email features (50 GB mailbox)

Best for: Businesses that need desktop Office apps for daily work. If your team relies on Excel macros, Access databases, or Publisher layouts, this is your baseline.

Microsoft 365 Business Premium (~$22/user/mo)#

This is the complete package for small and mid-sized businesses. It includes everything from Business Standard, but layers on advanced security, device management, and compliance tools. You get protection against threats, the ability to manage company-owned and personal devices, and features like conditional access that let you control who can access your data and from where.

What’s included:

• Everything in Business Standard
• Advanced threat protection for email and files
• Intune device management (MDM and MAM)
• Azure AD Premium P1 for identity and access management
• Conditional access and multi-factor authentication
• Information protection and data loss prevention
• Windows 10/11 Pro upgrade rights

Best for: Organizations that handle sensitive data, need to comply with industry regulations, or want to secure devices and control access. This is the plan you choose when security and compliance become priorities.

This guide covered the foundational licenses most businesses start with. Each plan serves a specific stage in your growth, from basic email to full security and compliance.

In Part 2, we’ll explore the Enterprise plans > E3, E5, and beyond … for organizations that need advanced compliance, analytics, and unlimited scale.