Microsoft 365 Exchange Online
Microsoft Exchange Online is a cloud-based email and calendaring service that delivers secure, reliable business communication. Part of the Microsoft 365 suite, Exchange Online provides organisations with enterprise-grade email hosting, shared calendars, contacts, and tasks — accessible from any device, anywhere.
What is Exchange Online?
Microsoft Exchange Online is a cloud-based messaging platform that delivers email, calendar, contacts, and tasks. It enables organisations to access business email, calendar, and contacts on PC, phone, and web browser with a familiar, easy-to-use interface.
Exchange Online provides a 99.9% uptime guarantee with built-in redundancy and disaster recovery. It includes enterprise-grade security features such as encryption at rest and in transit, Multi-Factor Authentication (MFA), and advanced threat protection against phishing, malware, and spam.
With a mailbox size of up to 100GB per user, integrated archive mailboxes, and seamless integration with Microsoft Teams, SharePoint, and Outlook, Exchange Online is the foundation of modern business communication. Whether accessed via Outlook desktop, Outlook on the web, or Outlook mobile, your email and calendar are always available.
Key FeaturesKey Features of Microsoft Exchange Online
Everything you need for secure, reliable business email and collaboration
Secure Business Email
Enterprise-grade email hosting with encryption, MFA, and advanced threat protection to safeguard your communications.
Shared Calendars
Schedule meetings, book resources, and track RSVPs with shared calendars that show real-time availability.
Cloud-Based Access
Access email, calendar, and contacts from any device — desktop, mobile, or web browser — anywhere in the world.
Advanced Threat Protection
Built-in protection against phishing, malware, and spam with Microsoft Defender for Office 365.
Email Archiving
In-place archive mailboxes with unlimited storage for compliance, eDiscovery, and long-term retention.
Cross-Platform Support
Native support for Outlook on Windows, Mac, iOS, Android, and web browsers for a consistent experience everywhere.
Data Loss Prevention
Policies and rules to prevent sensitive information from being shared inappropriately via email.
Team Collaboration
Seamless integration with Microsoft Teams, SharePoint, and OneDrive for a connected collaboration experience.
Disaster Recovery
Built-in redundancy with geo-distributed data centres ensuring 99.9% uptime and automatic failover.
Useful Links
• Exchange Online Overview
Learn about Microsoft Exchange Online — the cloud-based email and calendaring service that provides secure, reliable business communication with enterprise-grade features.
Read More →• Outlook for Business
Stay connected and organized wherever you work with Outlook — email, calendar, and contacts all in one place with enterprise-grade security.
Read More →• Exchange Online Protection
Exchange Online Protection (EOP) is a cloud-based filtering service that protects your organisation against spam, malware, and other email threats.
Read More →• Microsoft Defender for Office 365
Advanced threat protection for your email and collaboration tools — detect, investigate, and respond to sophisticated attacks across your Microsoft 365 environment.
Read More →Benefits of Using Exchange Online
Why businesses choose Exchange Online for secure, reliable email
Reliable, Secure Business Email
Exchange Online provides enterprise-grade email with a 99.9% uptime SLA, encryption at rest and in transit, and built-in multi-factor authentication to protect your communications.
Access Email Anywhere
Access your email, calendar, and contacts from any device — whether you're at the office, working from home, or on the move. Outlook desktop, mobile, and web all provide a seamless experience.
Built-In Advanced Threat Protection
Exchange Online Protection (EOP) and Microsoft Defender for Office 365 work together to shield your organisation from phishing, malware, ransomware, and spam — keeping your inbox safe.
Simplified Compliance & Archiving
In-place archive mailboxes, litigation hold, and data loss prevention policies help organisations meet regulatory requirements and manage email retention effectively.
Reduced IT Overhead
Microsoft manages the infrastructure, updates, and security patching — freeing your IT team to focus on strategic initiatives rather than email server maintenance.
Seamless Integration with Microsoft 365
Exchange Online works natively with Teams, SharePoint, OneDrive, and the full suite of Microsoft 365 apps, creating a unified and efficient collaboration environment.
Frequently Asked Questions
Common questions about Microsoft Exchange Online
Exchange Online is Microsoft's cloud-hosted email service, part of Microsoft 365. Unlike on-premise Exchange, Microsoft manages all infrastructure, security patches, and updates — eliminating the need for on-site servers while providing the same enterprise-grade features.
Exchange Online provides up to 100GB mailbox storage per user on Business plans, with an additional 50GB archive mailbox. Enterprise plans offer up to 100GB primary and 100GB archive storage.
Yes. Exchange Online includes encryption at rest and in transit, Multi-Factor Authentication, Conditional Access policies, Exchange Online Protection (EOP) for spam and malware, and Microsoft Defender for Office 365 for advanced threat protection.
Yes. Outlook mobile is available for both iOS and Android, providing full access to email, calendar, and contacts with a native, optimised mobile experience.
Yes. Exchange Online supports shared mailboxes, resource mailboxes (for rooms and equipment), distribution groups, and shared calendars — making team collaboration easy.