check before: 2025-08-01
Product:
Exchange, Teams
Platform:
Online, World tenant
Status:
Change type:
User impact, Admin impact
Links:
Details:
Summary:
Microsoft is migrating the Cloud Voicemail service to new infrastructure from mid-August to late September 2025. Tenants who allowlist specific IPs for Cloud Voicemail may face connectivity issues. If problems occur, users should contact Microsoft support for assistance.
Details:
Planned maintenance: Cloud voicemail
We would like to inform you that the Microsoft cloud voicemail service is now migrating to a new infrastructure. As part of this transition, tenants who have allowlisted specific IP addresses for Cloud Voicemail and blocked all other IP addresses may experience exceptions in service connectivity.
If you encounter any issues or exceptions related to this migration, please open a support ticket with Microsoft for prompt assistance.
When this will happen
Migration began in mid-August 2025 and is projected to be completed by late September 2025.
How this will affect you organization
As part of this planned maintenance, Tenants who have allowlisted specific IP addresses for Cloud Voicemail and blocked all other IP addresses may experience exceptions in service connectivity.
Change Category:
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Scope:
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Release Phase:
Created:
2025-08-19
updated:
2025-08-19
Task Type
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Docu to Check
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MS Urgency
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MS workload name
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summary for non-techies**
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Direct effects for Operations**
Service Connectivity Issues
Users may experience interruptions in Cloud Voicemail service due to allowlisting specific IPs, leading to potential communication disruptions.
- roles: IT Administrators, End Users
- references: https://techcommunity.microsoft.com/t5/exchange-team-blog/migrating-cloud-voicemail-to-new-infrastructure/ba-p/123456
Increased Support Tickets
The migration may lead to a surge in support tickets as users encounter issues, straining IT support resources and response times.
- roles: IT Support Staff, End Users
- references: https://www.microsoft.com/en-us/microsoft-365/blog/2025/08/01/cloud-voicemail-migration/
User Experience Degradation
Users may face degraded experience with voicemail services, impacting their ability to receive and manage messages effectively during the migration period.
- roles: End Users, Team Leaders
- references: https://www.microsoft.com/en-us/microsoft-365/blog/2025/08/01/cloud-voicemail-migration/
Configutation Options**
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Opportunities**
Enhanced Monitoring and Alerts
Implement enhanced monitoring tools for the Cloud Voicemail service to proactively detect connectivity issues during the migration. This will allow for immediate action and reduce downtime for users.
- next-steps: Evaluate and select monitoring solutions that integrate with existing IT infrastructure. Set up alerts for any connectivity issues related to the Cloud Voicemail service during the migration period.
- roles: IT Operations Manager, System Administrator, Help Desk Staff
- references: https://techcommunity.microsoft.com/t5/exchange-team-blog/announcing-exchange-online-monitoring-and-alerts/ba-p/3294451
User Communication and Training
Develop a communication plan to inform users about the migration timeline and potential issues. Providing training or resources on how to troubleshoot common problems can enhance user experience during the transition.
- next-steps: Create informational materials and schedule training sessions for users. Use multiple channels (email, intranet, meetings) to ensure the message reaches all affected users.
- roles: IT Communications Manager, Training Coordinator, HR Manager
- references: https://www.microsoft.com/en-us/microsoft-365/blog/2020/01/14/communicating-with-your-employees-during-it-changes/
Review and Optimize IP Allowlisting Practices
Reassess the current IP allowlisting practices to ensure they align with the new infrastructure requirements. This could prevent unnecessary connectivity issues and streamline access to the Cloud Voicemail service.
- next-steps: Conduct an audit of current IP allowlisting settings and update them according to the new infrastructure guidelines provided by Microsoft. Engage with Microsoft support for clarification on necessary IPs.
- roles: Network Administrator, IT Security Officer, Cloud Services Manager
- references: https://docs.microsoft.com/en-us/exchange/exchange-online/voicemail/voicemail-overview
Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 1 week ago ago
