Microsoft retires Microsoft 365 companion apps: what changes for companies
Microsoft has announced the retirement of the Calendar, People, and Files companion apps of Microsoft 365 starting December 16, 2026, urging IT administrators to remove them immediately from managed devices. The decision comes a year after the start of automatic distribution on compatible Windows 11 enterprise devices, scheduled for the end of December 2025.
Quick Answer
Microsoft will retire the Calendar, People, and Files companion apps of Microsoft 365 on December 16, 2026. IT administrators must remove them from managed devices. The apps, integrated with Copilot for contextual AI assistance, will no longer be supported after the retirement date. Microsoft has already stopped their automatic distribution through Microsoft 365 Apps updates.
The companion apps, designed to simplify daily workflows, offer integration with Copilot for contextual AI assistance, access to local and Microsoft 365-stored files, and calendar management directly from the Windows 11 application bar. Once installed, they automatically launched at device startup to allow users to quickly access contacts, files, and schedules.
IT administrators could disable automatic installation through device configuration settings in the Apps Admin Center, while users could disable automatic startup from each app's settings. However, Microsoft has now stopped the distribution of these apps through Microsoft 365 Apps updates and has invited administrators and users of unmanaged devices to manually uninstall them.
Security and Compliance Implications
The retirement of the companion apps raises important issues for incident response and NIS2 compliance. Companies that have integrated these tools into their workflows will need to plan an orderly migration to secure alternatives, ensuring that sensitive data is not exposed during the transition. The removal of the apps may also affect Data Loss Prevention (DLP) strategies, requiring an update of security policies to compensate for the loss of functionality offered by the apps.
Impact on Productivity and Integration with Other Solutions
Microsoft's decision to retire the companion apps could have repercussions on user productivity, particularly for those accustomed to using these integrated features. Companies will need to evaluate alternative solutions for calendar management, file access, and contact search, ensuring they are compatible with their existing IT ecosystems. Additionally, the transition may require an update of identity access management (IAM) policies, as the companion apps were closely integrated with user identities.
Another relevant aspect is the impact on enterprise cloud security. The companion apps were designed to work in a cloud environment, and their removal may require a rethinking of cloud security posture management (CSPM) strategies to ensure data remains protected during and after the transition. Companies may need to invest in Security Information and Event Management (SIEM) solutions to monitor any vulnerabilities introduced by the removal of the apps.
Recommendations for IT Administrators
IT administrators should start planning the removal of the companion apps from their environments immediately. This includes evaluating alternative solutions for the features offered by the apps, such as calendar management and file access. Additionally, companies should consider implementing a managed Security Operations Center (SOC as a Service) to ensure a secure and seamless transition.
It is also advisable to conduct a penetration test and a vulnerability assessment to identify any vulnerabilities introduced by the removal of the apps. This step is particularly important for companies that must comply with NIS2 adequacy and DORA regulation requirements, as digital operational security is an absolute priority.
Final Considerations
The retirement of Microsoft 365 companion apps represents a significant challenge for companies that have integrated these features into their workflows. However, with careful planning and the implementation of appropriate alternative solutions, companies can ensure a secure and seamless transition. IT administrators should work closely with security and compliance teams to ensure all bases are covered.
For more information on how to manage the transition, consult our guide to migrating Microsoft 365 apps and delve into our analysis on protecting sensitive data.
The Market Context and Available Alternatives
The retirement of Microsoft 365 companion apps fits into a broader context of cloud platform consolidation and reduction of application fragmentation. According to data from Gartner, 75% of companies plan to fully migrate to cloud solutions by 2025, a trend that explains the need to integrate features directly into operating systems. Market alternatives include solutions like institutional crypto custody for secure management of sensitive data, and identity management tools such as Okta and Ping Identity, which could compensate for the loss of functionality offered by the companion apps.
Impact on Risk Management and Cyber Insurance
The removal of the companion apps could significantly influence risk assessments for cyber insurance. According to a report by Munich Re, 60% of claims for security incidents are related to vulnerabilities linked to unsupported software. Companies that do not promptly update their breach remediation strategies may see an increase in insurance premiums, with an estimated cyber insurance cost growth of 15-20% for high-risk profiles.
Challenges for SMEs and Resource-Limited Organizations
For small and medium-sized enterprises (SMEs), the transition could represent a significant challenge. According to a survey by ISACA, 40% of SMEs do not have a dedicated security team, making it difficult to manage complex migrations. In these cases, adopting a MDR service (Managed Detection and Response) could be a practical solution, offering continuous monitoring and incident response without the need to invest in internal resources.
Considerations on Taxation and Tax Compliance
An often overlooked aspect is the tax impact of migration. With the introduction of Italy crypto taxation and new regulations on bitcoin declaration, companies that manage sensitive financial data will need to ensure that new solutions comply with local laws. A crypto accountant or crypto tax consultant may be necessary to ensure compliance with evolving regulations, especially for companies operating in sectors at high risk of money laundering.
The Importance of User Training
The removal of the companion apps is not just about technology but also about changing user behavior. According to a study by Forrester Research, 70% of security incidents are caused by human error. Companies will need to invest in training programs to ensure that employees can use the new solutions safely and efficiently. This includes understanding new crypto anti-money laundering (AML) and KYC exchange policies, if applicable.
The Future of Security and Integration with AI
Looking ahead, integration with artificial intelligence will remain a priority. According to a report by McKinsey & Company, 50% of companies plan to implement AI solutions for security by 2027. Companies that adopt a proactive approach, investing in zero trust architecture and disaster recovery as a service (DRaaS), will be better positioned to address emerging challenges. Additionally, compliance with the DORA regulation and the NIS2 directive will be crucial to ensuring digital operational resilience.
Conclusion and Future Forecasts
The retirement of Microsoft 365 companion apps represents a milestone in the cybersecurity landscape. Companies that act quickly to evaluate alternatives and implement secure solutions will be at an advantage. As the regulatory and technological landscape evolves, adopting a holistic approach that integrates NIS2 compliance, digital operational resilience, and identity management will be essential to ensure security and operational continuity. Forecasts indicate that companies investing in ISO 27001 certification and security audits will see a significant return in terms of risk reduction and reputation improvement.
Frequently Asked Questions
What are the alternatives to Microsoft 365 companion apps?
Alternatives include identity management solutions such as Okta and Ping Identity, Data Loss Prevention (DLP) tools, and Security Information and Event Management (SIEM) platforms. Companies may also consider adopting an MDR service for continuous monitoring and incident response.
How does the retirement of the companion apps affect insurance premiums?
The retirement could increase insurance premiums for companies that do not promptly update their breach remediation strategies. According to Munich Re, the cost of cyber insurance could grow by 15-20% for high-risk profiles.
What are the challenges for SMEs in managing the transition?
SMEs may face significant challenges, especially if they do not have a dedicated security team. Adopting an MDR service could be a practical solution, offering continuous monitoring and incident response without the need to invest in internal resources.
How does crypto taxation affect the management of sensitive data?
What are the future trends in cybersecurity?
Future trends include integration with artificial intelligence, adoption of zero trust architecture and disaster recovery as a service (DRaaS). Compliance with the DORA regulation and the NIS2 directive will be crucial to ensuring digital operational resilience.
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