Microsoft 365 to Replace Root Certificate (2025)

With Microsoft 365 planning to replace their Root SSL Certificate in 2025, organizations need reliable SSL Certificate solutions from trusted providers. Trustico® SSL Certificates offer the perfect combination of security, validation, and browser compatibility to ensure your Microsoft 365 services remain protected and compliant.

Understanding the 2025 Root SSL Certificate Change

Microsoft has announced plans to update their Root SSL Certificate infrastructure by 2025, affecting millions of Microsoft 365 users worldwide.

This change requires organizations to implement new SSL Certificates that meet enhanced security requirements and maintain compatibility with Microsoft services.

Trustico® offers both Trustico® branded and Sectigo® branded SSL Certificates that are fully compatible with Microsoft 365 services. Our SSL Certificates utilize modern encryption standards and validation methods to ensure seamless integration with Microsoft infrastructure.

The upcoming change involves Microsoft transitioning from their current Baltimore CyberTrust Root to the Microsoft RSA Root Certificate Authority 2017. This fundamental infrastructure change will affect all services that rely on Microsoft 365 authentication and encryption systems.

Impact on Microsoft 365 Environments

Organizations using Microsoft 365 services need to understand how this Root SSL Certificate change will affect their operations.

Any custom applications, third-party integrations, or hybrid configurations that interact with Microsoft 365 may require SSL Certificate updates.

Services particularly affected include Exchange Online, SharePoint Online, Teams, and any custom applications using Microsoft authentication.

Without proper SSL Certificate preparation, these services could experience disruptions when Microsoft implements the Root SSL Certificate change.

Trustico® SSL Certificates are designed to maintain compatibility through this transition period, ensuring your Microsoft 365 environment continues operating smoothly before, during, and after the Root SSL Certificate change.

Recommended SSL Certificate Solutions

For Microsoft 365 environments, Trustico® recommends our Organization Validation (OV) or Extended Validation (EV) SSL Certificates. These premium SSL Certificates provide the high-assurance validation and encryption strength needed for enterprise applications.

Our Sectigo® branded SSL Certificates feature advanced capabilities including unlimited server licensing, free reissues, and priority validation. Trustico® branded SSL Certificates deliver additional benefits like dedicated support and competitive pricing.

For hybrid Microsoft 365 deployments that maintain on-premises components, Trustico® Multi-Domain SSL Certificates offer an efficient solution for securing multiple services under a single SSL Certificate.

This approach simplifies SSL Certificate management while ensuring consistent security across your entire Microsoft environment.

Implementation Best Practices

When preparing for Microsoft 365 Root SSL Certificate changes, proper planning and execution are essential. Trustico® provides comprehensive implementation guidance and technical support to ensure a smooth transition.

We recommend starting with a thorough inventory of affected services and establishing a clear timeline for SSL Certificate deployment. This systematic approach helps prevent service disruptions and maintains security throughout the migration.

Begin by identifying all services that interact with Microsoft 365, including third-party applications, custom integrations, and legacy systems. Each of these components may require SSL Certificate updates to maintain compatibility with Microsoft's new Root SSL Certificate infrastructure.

Implement a phased deployment approach, starting with non-critical systems to identify and resolve any potential issues before updating mission-critical services.

Trustico® SSL Certificates can be tested in parallel with existing SSL Certificates to verify compatibility before full deployment.

Key Benefits of Trustico® SSL Certificates

Organizations choosing Trustico® SSL Certificates benefit from our decade-plus experience in SSL Certificate provisioning. We offer rapid validation, dedicated support, and competitive pricing on our complete range of SSL Certificate products.

Trustico® SSL Certificates provide robust encryption, helping protect sensitive data and communications across Microsoft 365 services.

Our SSL Certificates are backed by industry-leading warranty protection and compatibility guarantees.

The technical specifications of Trustico® SSL Certificates exceed Microsoft's requirements, featuring 2048-bit minimum key length and SHA-256 hashing algorithms. This ensures long-term compatibility with Microsoft's evolving security standards beyond the 2025 Root SSL Certificate change.

Our SSL Certificates include flexible validity options that align with your organization's Microsoft 365 migration timeline. This flexibility allows you to implement new SSL Certificates at the optimal time for your specific environment while maintaining continuous protection.

Maintaining Compliance and Security

The 2025 Root SSL Certificate change presents an opportunity to enhance your Microsoft 365 security posture. Trustico® SSL Certificates meet or exceed all major compliance requirements including PCI DSS, HIPAA, and GDPR.

Regular SSL Certificate maintenance and monitoring are essential for ongoing security. Trustico® provides automated renewal reminders and SSL Certificate management tools to help maintain continuous protection for your Microsoft 365 environment.

Implement a comprehensive SSL Certificate inventory system to track all SSL Certificates affected by the Microsoft Root SSL Certificate change. This inventory should include expiration dates, deployment locations, and responsible stakeholders to ensure no SSL Certificates are overlooked during the transition.

Consider implementing SSL Certificate pinning with caution in Microsoft 365 environments. While pinning can enhance security, it requires careful configuration to accommodate the Root SSL Certificate change without causing service disruptions.

Technical Considerations for Microsoft 365 Integration

When implementing SSL Certificates for Microsoft 365 environments, several technical factors require attention. Trustico® SSL Certificates support the specific cryptographic requirements needed for seamless Microsoft integration.

Ensure your SSL Certificates include the necessary Subject Alternative Names (SANs) to cover all domains and subdomains used by your Microsoft 365 services. Trustico® Multi-Domain SSL Certificates can accommodate multiple SANs under a single certificate, simplifying management.

For organizations with hybrid Exchange deployments, SSL Certificate configuration requires particular attention to maintain mail flow and authentication between on-premises and cloud components.

Trustico® SSL Certificates are fully compatible with hybrid Exchange scenarios and include implementation guidance specific to these environments.

Microsoft 365 authentication systems rely on properly configured SSL Certificate trust chains. Trustico® SSL Certificates include complete certificate chains to ensure proper validation across all Microsoft services and client applications.

Getting Started with Trustico®

Preparing for the 2025 Microsoft Root SSL Certificate change starts with choosing the right SSL Certificate provider. Trustico® offers expert consultation to help determine the optimal SSL Certificate solution for your specific needs.

Contact our SSL Certificate specialists today to discuss your Microsoft 365 SSL Certificate requirements. We will guide you through the selection, validation, and implementation process to ensure your services remain secure and compliant.

Begin with a comprehensive assessment of your current Microsoft 365 environment to identify all components that will be affected by the Root SSL Certificate change.

Trustico® can help develop a tailored SSL Certificate strategy based on your specific infrastructure and security requirements.

Trust Trustico® to provide the SSL Certificate expertise and solutions you need to navigate Microsoft's 2025 Root SSL Certificate change with confidence. Our commitment to security, compliance, and customer support makes us the ideal partner for organizations seeking to maintain Microsoft 365 service continuity through this important transition.