What Is Microsoft 365? Plans, Apps & Business Guide 2026

Microsoft 365 is a cloud-based subscription service from Microsoft that bundles productivity applications (Word, Excel, PowerPoint, Outlook), collaboration tools (Teams, SharePoint, OneDrive), and enterprise security features into a single monthly or annual plan. It replaced the one-time purchase model of Microsoft Office with a subscription that includes continuous updates, cloud storage, and advanced administration controls.

In simple terms: Microsoft 365 is everything your business needs to create documents, send email, collaborate with your team, and secure your data — all delivered from the cloud and always up to date.

With 12,100 monthly searches for "what is microsoft 365," there is clearly widespread confusion about what the product includes, how it differs from traditional Office, and which plan is right for different business sizes. This guide clears that up.

Microsoft 365 vs. Microsoft Office: What's the Difference?

This is the #1 source of confusion. Here is the clear distinction:

Feature	Microsoft Office (One-Time Purchase)	Microsoft 365 (Subscription)
Payment model	One-time fee ($149-$439)	Monthly/annual subscription ($6-$57/user/month)
Updates	No feature updates (security patches only)	Continuous feature updates
Cloud storage	Not included	1 TB OneDrive per user
Microsoft Teams	Not included	Included in all business plans
Email hosting	Not included	50 GB Exchange Online mailbox
Admin controls	None (desktop app only)	Full admin center with user/device management
Security features	Basic	Advanced threat protection, DLP, compliance tools
Device installs	1 PC or Mac	Up to 5 devices per user

Bottom line: Microsoft Office is a set of desktop apps you buy once. Microsoft 365 is a complete business platform that includes those apps plus email, storage, collaboration, security, and device management — all kept current with the latest features.

What Apps Are Included in Microsoft 365?

Core Productivity Apps

• Word: Document creation with real-time co-authoring and AI-powered Copilot writing assistance
• Excel: Spreadsheets with advanced data analysis, Power Query, and pivot tables
• PowerPoint: Presentations with Designer AI for professional layouts
• Outlook: Email client with calendar, contacts, and task management
• OneNote: Digital notebook for meeting notes and project documentation

Collaboration Tools

• Microsoft Teams: Chat, video meetings, phone system, and app integration hub. Used by 320+ million monthly active users.
• SharePoint Online: Intranet, document management, and team sites
• OneDrive for Business: 1 TB cloud storage per user with file sync and sharing
• Planner / To Do: Task and project management
• Lists: Customizable tracking for issues, assets, and workflows

Security and Compliance (Business Premium and Enterprise)

• Microsoft Defender for Office 365: Protection against phishing, malware, and zero-day attacks
• Intune: Mobile device management (MDM) and mobile application management (MAM)
• Entra ID (Azure AD): Identity and access management with conditional access policies
• Data Loss Prevention (DLP): Prevent sensitive data from being shared outside the organization
• Information Protection: Sensitivity labels, encryption, and rights management
• Compliance Manager: Assessment tools for GDPR, HIPAA, PCI DSS, and other standards

Microsoft 365 Business Plans Compared

Feature	Business Basic ($6/user/mo)	Business Standard ($12.50/user/mo)	Business Premium ($22/user/mo)
Web/mobile apps	Yes	Yes	Yes
Desktop apps (Word, Excel, etc.)	No	Yes	Yes
Email (Exchange Online)	50 GB	50 GB	50 GB
OneDrive storage	1 TB	1 TB	1 TB
Microsoft Teams	Yes	Yes	Yes
SharePoint	Yes	Yes	Yes
Webinar hosting	No	Yes (up to 300)	Yes (up to 300)
Defender for Office 365	No	No	Yes
Intune (device management)	No	No	Yes
Entra ID Premium P1	No	No	Yes
Autopilot	No	No	Yes
Max users	300	300	300

Which Plan Should You Choose?

• Business Basic ($6): Best for organizations that only need email, Teams, and cloud storage. Users work primarily in web browsers or on mobile devices.
• Business Standard ($12.50): Best for most small businesses. Includes desktop apps (Word, Excel, PowerPoint) plus all collaboration tools. The most popular plan.
• Business Premium ($22): Best for businesses handling sensitive data or needing device management. Adds advanced security, Intune, and Defender. Recommended for businesses with remote workers or BYOD policies.

Microsoft 365 Enterprise Plans

For organizations with more than 300 users or advanced requirements:

Plan	Price	Key Additions
E1	$8/user/mo	Web apps only, no desktop apps (like Business Basic but unlimited users)
E3	$36/user/mo	Desktop apps, advanced compliance, 100 GB mailbox, unlimited archive
E5	$57/user/mo	Everything in E3 plus Defender for Endpoint, Teams Phone, Power BI Pro, advanced eDiscovery

Is Microsoft 365 Free?

Microsoft 365 is not free for businesses, but there are limited free options:

• Microsoft 365 web apps: Free versions of Word, Excel, and PowerPoint at office.com with limited features and 5 GB OneDrive storage
• Microsoft Teams (free): Basic chat and meetings for up to 100 participants with 60-minute meeting limit
• 1-month free trial: Microsoft offers a free trial of all business plans
• Education: Free for qualifying educational institutions (A1 plan)
• Nonprofits: Free Business Basic or heavily discounted Business Premium through Microsoft's nonprofit program

For any business that relies on email, document collaboration, or needs admin controls over user accounts, the paid subscription is essential. The free tier lacks email hosting, admin tools, and security features.

Microsoft 365 Security Features

Security is where Microsoft 365 differentiates itself from simple productivity suites. The platform includes layered protections that most businesses could never implement independently.

Identity Security

• Multi-Factor Authentication (MFA): Free with all plans. Blocks 99.9% of automated attacks.
• Conditional Access: Policies that control access based on location, device state, risk level (Business Premium/E3+).
• Passwordless Authentication: Windows Hello, FIDO2 keys, and Microsoft Authenticator phone sign-in.

Email Security

• Exchange Online Protection (EOP): Anti-spam, anti-malware filtering included with all plans.
• Safe Links: Real-time URL scanning that checks links at time of click (Business Premium/E5).
• Safe Attachments: Sandboxing that detonates suspicious attachments in a virtual environment before delivery (Business Premium/E5).

Device Security

• Microsoft Intune: Manage company and BYOD devices, enforce policies, deploy apps remotely (Business Premium/E3+).
• Remote Wipe: Erase company data from lost or stolen devices without affecting personal data.
• BitLocker Management: Centralized disk encryption management for Windows devices.

Common Microsoft 365 Administration Tasks

Managing Microsoft 365 for a business involves ongoing administration that goes beyond the initial setup:

• User lifecycle management: Onboarding new employees (creating accounts, assigning licenses, configuring mailboxes) and offboarding departing staff (disabling accounts, preserving data, reassigning licenses)
• Security configuration: Enabling MFA tenant-wide, configuring conditional access policies, setting up DLP rules, and managing sensitivity labels
• Email management: Configuring shared mailboxes, distribution groups, mail flow rules, email signatures, and retention policies
• Compliance: Running eDiscovery searches, managing audit logs, configuring data retention, and generating compliance reports
• Monitoring: Reviewing sign-in logs for suspicious activity, tracking license utilization, and monitoring service health
• Updates and change management: Evaluating new features from Microsoft's monthly updates and communicating changes to end users

Microsoft 365 for MSPs

For managed service providers, Microsoft 365 is typically the foundation of every client relationship. Most MSP clients run their email, collaboration, and productivity on Microsoft 365, making M365 administration a core competency.

The challenge is scale. Managing Microsoft 365 across 20, 50, or 100+ client tenants requires:

• Multi-tenant management: Efficiently administering dozens of separate M365 tenants
• Standardized security baselines: Applying consistent security configurations (MFA, conditional access, anti-phishing) across all clients
• Proactive monitoring: Watching for compromised accounts, license expirations, and configuration drift
• User support: Handling password resets, Outlook issues, Teams problems, and SharePoint permissions
• Migration expertise: Moving clients from Google Workspace, on-premises Exchange, or other platforms to M365

This is exactly where white-label Microsoft 365 support helps MSPs scale. At Medha Cloud, our certified M365 administrators handle day-to-day tenant management, security hardening, and user support under your brand so your team can focus on strategic client relationships.

What Happens If You Cancel Microsoft 365?

Understanding the cancellation process prevents data loss:

1. Grace period (30 days): After your subscription expires, you have 30 days where the service is still accessible but no new purchases can be made.
2. Disabled state (90 days): After the grace period, the account is disabled. Only admins can access data. Users cannot sign in.
3. Deletion (after 90 days): Microsoft permanently deletes all data including mailboxes, OneDrive files, and SharePoint sites.

Critical: Always export or back up your data before canceling. Microsoft 365 data is not automatically backed up to a separate location. We recommend third-party backup solutions (Veeam, Datto, Druva) for all business-critical M365 data.

Frequently Asked Questions

What is Microsoft 365 and do I need it?

Microsoft 365 is a cloud subscription that includes Office apps (Word, Excel, PowerPoint), email (Outlook/Exchange), collaboration (Teams, SharePoint), and cloud storage (OneDrive). If your business sends email, creates documents, or needs employees to collaborate, then yes, you likely need it. It is the standard business productivity platform used by over 400 million paid users worldwide.

What is the difference between Microsoft Office and Microsoft 365?

Microsoft Office is a one-time purchase ($149-$439) that gives you desktop apps with no updates, no cloud storage, and no email hosting. Microsoft 365 is a monthly subscription ($6-$57/user) that includes the same apps plus continuous updates, 1 TB cloud storage, business email, Teams, SharePoint, and security features. For businesses, Microsoft 365 is the clear choice.

Is Microsoft 365 free?

Basic web versions of Word, Excel, and PowerPoint are free at office.com with 5 GB storage. A free Teams tier exists with limited features. However, business use requires a paid plan for email hosting, admin controls, security features, and full desktop applications. Plans start at $6/user/month for Business Basic.

What happens if I delete Microsoft 365?

When you cancel, there is a 30-day grace period with full access, then 90 days in disabled state where only admins can retrieve data, then permanent deletion. Always back up your mailboxes, OneDrive files, and SharePoint data before canceling. Microsoft does not provide data recovery after the deletion period.

Key Takeaways

• Microsoft 365 is a cloud subscription bundling Office apps, email, Teams, storage, and security features.
• It replaces the old one-time Office purchase with continuous updates and cloud services.
• Business Standard ($12.50/user/mo) is the most popular plan for small businesses.
• Business Premium ($22/user/mo) adds critical security features including Intune and Defender.
• Security features like MFA, Safe Links, and conditional access make M365 far more than just productivity software.
• MSPs can scale M365 management across multiple tenants with white-label Microsoft 365 support.