Microsoft 365 has become part of the daily infrastructure of many businesses. Email runs through Outlook, meetings are organised in Teams, files are stored in OneDrive or SharePoint, and calendars keep teams coordinated.

When those services are unavailable, the effects can spread across an entire organisation surprisingly quickly.

On 31 August 2026, a significant Microsoft 365 incident affected Exchange Online and other connected services. Users experienced problems sending and receiving emails, accessing mailboxes, signing in, searching for content and using parts of OneDrive, SharePoint and Teams. Microsoft traced the disruption to an issue involving a core authentication configuration and gradually restored the affected services.

The incident was a useful reminder for businesses: moving to the cloud can improve flexibility, collaboration and security, but no technology platform is completely immune to disruption.

The real question is not whether your business uses the cloud. It is whether your business can continue operating when an important cloud service becomes temporarily unavailable.

How dependent is your business on Microsoft 365?

Consider what would happen if your team suddenly lost access to Microsoft 365 for several hours.

Could employees contact clients without Outlook? Would they still have access to important telephone numbers and documents? Could meetings continue without Teams? Would staff know whether the problem came from Microsoft, the company network, an individual account or their own computer?

For many organisations, the difficulty is not only the outage itself. It is the uncertainty that follows.

Employees begin restarting devices, changing passwords or repeatedly trying to send the same message. Managers receive conflicting information. Clients may be left without an update. Without a clear response procedure, a technical interruption can quickly become a wider operational problem.

Cloud availability and data protection are not the same thing

A cloud outage, data loss and a local IT problem require different responses.

• A cloud outage means the provider’s service is temporarily unavailable or degraded.
• Data loss may be caused by accidental deletion, malware, account compromise, corruption or an incorrect retention setting.
• A local IT problem may originate from your internet connection, network, device, software configuration or user account.

This distinction matters because a backup alone will not make Microsoft 365 available during a provider-side outage. Backups are essential for protecting and recovering business data, while a business continuity plan explains how the organisation will operate until the unavailable service returns.

A resilient business needs both.

Seven ways to prepare for a cloud outage

1. Identify the services your business cannot operate without

Create a simple list of the cloud services used across the business and the processes that depend on them. This could include email, shared files, calendars, video meetings, customer records, accounting systems and internal approval processes.

Prioritise them according to business impact. A system used once a month does not require the same response as the email platform used to communicate with clients throughout the day.

2. Establish an approved alternative communication channel

If Outlook or Teams becomes unavailable, employees should already know how urgent internal updates will be shared.

This might involve telephone calls, SMS or another company-approved platform. The alternative should be agreed in advance, accessible to the relevant employees and appropriate for the information being communicated.

Sensitive business or client information should not be moved to personal apps simply because the main system is unavailable.

3. Keep essential information accessible

Identify the documents and contact information that would be required during an interruption. Where appropriate, selected files can be made available offline on secured and managed devices.

This does not mean creating uncontrolled copies of company data. Offline access should be planned carefully, protected with appropriate permissions and limited to genuinely essential information.

4. Monitor the correct service-health information

During an outage, fast and accurate diagnosis prevents employees from wasting time troubleshooting a problem they cannot fix locally.

Microsoft provides service-health information through the Microsoft 365 admin centre. A designated person or IT provider should be responsible for checking active incidents, assessing which users and services are affected, and communicating reliable updates to the rest of the business.

5. Maintain an independent backup and recovery strategy

Do not assume that storing information in the cloud removes the need for backups.

Your business should understand:

• What information is being backed up
• How frequently backups run
• How long information is retained
• Who can access the backups
• How quickly the information can be restored

Backups should cover the services and data that matter to the organisation, and restoration should be tested. A successful backup notification is reassuring, but a verified recovery process is far more valuable.

6. Keep devices, networks and accounts properly managed

A provider outage can happen at the same time as an unrelated local problem. Regular maintenance, software updates, secure network configuration, device monitoring and properly managed user accounts make it easier to separate the two.

This allows the IT team to determine whether the issue affects the wider Microsoft platform, the organisation’s Microsoft 365 environment, a particular office or an individual user.

7. Test the plan before it is needed

A continuity plan should not exist only as a document that nobody has opened.

Run a short exercise: assume that email and Teams are unavailable for half a day. Ask managers how they would contact employees and clients, access urgent files, continue scheduled meetings and report the incident.

The test will usually reveal missing contact details, unclear responsibilities or processes that rely too heavily on one platform. Those gaps are much easier to address before a real disruption.

What managed IT support can do during an outage

No IT provider can prevent a global Microsoft service incident. However, effective IT management can significantly improve how a business responds.

A managed IT team can:

• Determine whether the problem is local, account-specific or provider-wide
• Check official service-health information and monitor recovery
• Give employees clear instructions and reduce unnecessary troubleshooting
• Activate agreed communication and continuity procedures
• Verify that systems, mail flow and access are working correctly after recovery
• Investigate any remaining issues affecting individual users

The objective is not to promise that downtime will never happen. It is to reduce confusion, protect business information and help the organisation return to normal operations as efficiently as possible.

Is your business prepared?

The recent Microsoft 365 outage should not discourage businesses from using cloud technology. It should encourage them to examine how much of their operation depends on a small number of systems and whether they have planned for temporary disruption.

Ask your team:

• Do we know which systems are essential to daily operations?
• Can we communicate if our main email and collaboration tools are unavailable?
• Is someone responsible for checking service incidents and coordinating updates?
• Are our Microsoft 365 data and other critical systems backed up appropriately?
• Have we tested whether important information can be recovered?
• Do employees know whom to contact when something goes wrong?

If any of those answers are unclear, the business has an opportunity to strengthen its IT resilience.

Centric supports businesses with Microsoft 365 management, cloud solutions and backups, regular maintenance and updates, network setup and security, 24/7 monitoring, fast technical support and on-site assistance when required.

Want to understand how prepared your business is? Contact Centric to discuss your Microsoft 365 environment, backup strategy and business continuity needs.