Exchange Online
Exchange Online is Microsoft's cloud-based email and calendaring service, included with every Microsoft 365 business plan. It provides enterprise-grade email with a 50–100GB mailbox per user, shared mailboxes, resource mailboxes, and advanced features like legal hold, eDiscovery, and data loss prevention. For UK businesses still running on-premises Exchange Server — which reached end of support for 2013 and 2016 versions — migrating to Exchange Online is no longer optional; it's a security and compliance imperative. We help businesses across London and the UK migrate to Exchange Online with zero downtime, configure it securely, and manage it ongoing — ensuring your email is reliable, secure, and compliant.
Exchange Online is Microsoft's cloud-hosted email and calendaring platform, part of the Microsoft 365 suite. It provides each user with a 50GB mailbox (100GB on Plan 2), shared mailboxes for team addresses like info@ or sales@, resource mailboxes for meeting rooms and equipment, and advanced features including legal hold, eDiscovery, data loss prevention, and journaling. It is accessed through Outlook desktop, Outlook on the web, Outlook mobile, or any IMAP/POP client, and includes Exchange Online Protection for spam and malware filtering.
Understanding Exchange Online
Exchange Online is Microsoft's cloud-hosted email and calendaring platform, part of the Microsoft 365 suite. It provides each user with a 50GB mailbox (100GB on Plan 2), shared mailboxes for team addresses like info@ or sales@, resource mailboxes for meeting rooms and equipment, and advanced features including legal hold, eDiscovery, data loss prevention, and journaling. It is accessed through Outlook desktop, Outlook on the web, Outlook mobile, or any IMAP/POP client, and includes Exchange Online Protection for spam and malware filtering.
The business impact
Email is the most critical business communication tool, and Exchange Online provides enterprise-grade reliability, security, and compliance without the cost and complexity of running on-premises Exchange servers. With Exchange Server 2013 and 2016 reaching end of support, businesses still running these versions face security risks, compliance issues, and increasing maintenance costs. Exchange Online provides automatic updates, 99.9% uptime SLA, and built-in security features that on-premises Exchange cannot match without significant investment.
Who needs this?
Any business currently running on-premises Exchange Server (especially end-of-life versions), businesses using consumer or free email for business purposes, and businesses that need enterprise email features like shared mailboxes, legal hold, or eDiscovery. Essentially every UK business that relies on email for communication should be on Exchange Online or an equivalent enterprise email platform.
Who doesn't need this?
Businesses already on Google Workspace that are happy with Gmail do not need Exchange Online. Very small businesses (1–3 users) that only need basic email may find consumer Outlook.com or Gmail sufficient, though they lose business features like custom domains, shared mailboxes, and compliance features.
The technical overview
Exchange Online is hosted in Microsoft's cloud and accessed through Outlook clients or web browser. Email flows through Microsoft's data centres, where Exchange Online Protection filters spam, malware, and phishing before it reaches your mailbox. Administration is done through the Exchange admin centre, where you manage mailboxes, groups, policies, and compliance features. We handle migration, configuration, security, and ongoing management — ensuring your email is reliable, secure, and compliant.
Related technologies
What affects the cost?
Expert recommendations
Enable multi-factor authentication for all Exchange Online accounts — email accounts are the #1 target for cybercriminals.
Configure Exchange Online Protection policies and consider adding Mimecast for enterprise-grade email security.
Implement data loss prevention (DLP) policies to prevent sensitive information from leaving your organisation via email.
Use shared mailboxes for team addresses rather than individual accounts — this ensures continuity when staff leave.
Implement retention policies to automatically archive or delete old email, reducing mailbox size and improving compliance.
Regularly audit mailbox permissions and forwarding rules to detect unauthorised access.
Industries that benefit
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Exchange Online — your questions answered
Common questions about exchange online, pricing, implementation, and best practices.
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