On October 14, 2025, Microsoft will officially end support for Exchange Server 2016 and Exchange Server 2019. After this date, no further technical support or extended security updates will be available for either version.
What does this mean for your organization?
Continuing to use Exchange Server 2019 beyond the support deadline will leave your environment unsupported, exposing your systems to increasing risk. Microsoft will no longer provide security patches or assist with issues—including those related to hybrid configurations.
Key risks
No security updates
Your servers will be increasingly vulnerable to new threats and cyberattacks due to the lack of critical security patches.
No bug fixes
System issues that arise will go unresolved, potentially causing instability or downtime.
No technical support
In case of service disruptions—like mail delivery failures—Microsoft support will no longer be available.
No additional licenses
With end-of-support, purchasing additional licenses for Exchange 2016 or 2019 will no longer be possible.
What are your options?
If you MUST remain on-premise
Upgrade your current setup to Exchange Server Subscription Edition (SE)* to ensure continued support and security.
Still, we recommend planning a future migration to the cloud to overcome the long-term limitations of maintaining on-premises infrastructure.
*Organizations with E3/E5 licenses under an Enterprise Agreement can upgrade to Exchange SE without incurring additional costs.
If you’re READY TO MOVE beyond on-premise
Migrate fully to Exchange Online within Microsoft 365 to simplify management, boost availability, and reduce costs.
About OChK
OChK is a certified Microsoft partner holding both CSP (Cloud Solution Provider) and LSP (Licensing Solution Provider) statuses. We are one of only a few organizations in Poland authorized to provide Microsoft’s on-premises licensing solutions—an offering that complements our cloud portfolio and enables seamless hybrid environments.
The OChK team's professionalism is confirmed by numerous Microsoft certificates and a proven track record of successful implementations. We have earned multiple Microsoft Solution Partner designations in the following areas:
OChK’s experts provide end-to-end support throughout the migration process. Our scope of support includes:
designing the entire migration process—from requirements analysis to preparing an action plan
upgrading servers
configuring endpoints between on-premise and Exchange Online environments
setting up domain delegation for Microsoft 365
selecting licenses tailored to your needs
configuring data retention policies
configuring security policies, including protection against phishing, malware, and spam (if covered by your licenses)
conducting pilot testing to validate configuration before go-live
configuring the production environment and performing delta migration
shutting down local environment
providing recommendations for further environment development, e.g. data loss prevention policies
delivering training materials and guides for administrators
Full migration from Exchange Server to Exchange Online
We successfully delivered a complete migration from Exchange Server (on-premise) to Exchange Online for a financial sector client—ensuring full compliance, enterprise-grade security, and seamless integration with existing systems. The project included steps such as configuring sensitivity labels, DLP, and conditional access, securing Microsoft 365 with anti-phishing and anti-spoofing mechanisms, migrating mailboxes (including shared mailboxes and distribution lists), and synchronizing the address book for the entire organization. Key outcomes of the project included:
reduced infrastructure costs and simplified management,
full compliance with financial sector regulations,
enterprise-level email security,
long-term service continuity through cloud-native support.
Trusted by leading organizations
We support businesses in planning, implementing, and maintaining Microsoft solutions—combining deep technical expertise with security/compliance know-how. Our completed projects include, among others: migrating on-premises environments to Microsoft Azure, implementing Microsoft Defender for Endpoint, migrating email to Exchange Online, implementing, configuring, and securing M365 packages, as well as reviewing tool configurations for cybersecurity best practices.
Why choose OChK?
Strategic partnership for maximum value
As a strategic Microsoft partner, we offer competitive discounts, preferential pricing, and additional funding to accelerate cloud adoption.
Experience and certified expertise
The OChK team's professionalism and expertise are confirmed by their numerous certificates, successfully completed projects, and designations.
Flexible billing options
We support multi-currency billing and flexible models like pay-as-you-go. We also advise on cost management and optimization.
Comprehensive support
Our partnership with Microsoft ensures prompt and efficient resolution of licensing, business, and technical challenges.
Knowledge sharing and skill building
We work as one team with our clients—accelerating results while strengthening internal capabilities through collaboration.
Broad range of added services
We guide clients through every stage of cloud transformation, with additional expertise in areas like SOC, data analytics/AI, and Managed Services.
Enterprise-grade security
We apply advanced security practices and support our clients in meeting regulatory compliance requirements.
Secure the future of your email infrastructure
Take advantage of the support of a trusted partner in migrating from Microsoft Exchange Server and contact the experts at OChK.
Related services
SOC as a Service
Monitoring of client resources to ensure continuous operation, correct configuration, and seamless integration of IT environments.
Data Analytics / AI
Services which help you leverage the potential of Big Data and advanced AI algorithms.