Microsoft’s Outlook Outage Drags On: Indian Enterprises Are Feeling The Heat

For Kriti, a Gurugram-based marketing professional, Thursday’s workday came to an abrupt halt even before it began, as Microsoft services went down globally.  

With her company relying heavily on Outlook for official sign-offs, the outage stalled its approval pipeline, forcing employees to turn to alternative communication channels and negotiate deadline extensions to keep work moving.

“With Outlook inaccessible since morning, external communication has been stalled, delaying roughly half a day’s worth of urgent approvals and project rollouts,” she said. 

Kriti’s experience reflects a wider disruption across enterprises and individuals in India and globally. Microsoft Outlook/Office 365 is used at companies such as Infosys, Wipro, Lupin, CitiusTech, CSS Corp, Indigo, along with banks such as State Bank of India, Equitas Small Finance Bank and others.

What Caused The Outage

The outage, which began late on November 12, crippled critical functions across Outlook, Teams, SharePoint, Copilot and several other Microsoft 365 services in 74 countries, including India. By November 13, the disruption was still unresolved.

Downdetector data showed Outlook complaints in the country peaking at 2,157 late night on Thursday, easing overnight, then climbing back to nearly 4,000 by 10 AM Friday before settling to over 2,500 by noon. 

Globally, the monitoring website has detected 1,40,000 complaints. To be sure, over 430 Mn people use Microsoft 365 apps according to the company’s website.

The trouble traces back to roughly 11:30 PM IST (6 PM UTC) on Thursday, when a core process responsible for setting up secure connections on Microsoft’s servers became overwhelmed. 

Microsoft said a number of servers began failing automated health checks and dropping out of service, which pushed more load onto the machines left standing, a cascade that eventually hit Exchange Online, Teams, SharePoint, OneDrive, Copilot, Defender for Office 365, Windows 365 Cloud PCs, and even the admin tools IT teams needed to diagnose the mess, such as Intune. Microsoft has attributed this outage to infrastructure failure. 

By Friday afternoon (November 13), Microsoft was still offering no confirmed timeline for full recovery, describing progress only as “limited.” The disruption even reached outside Microsoft’s own walls: OpenAI and Anthropic both reported problems with their Microsoft 365 connectors, a small but telling sign of how deeply the Exchange and Graph APIs are now wired into the newer AI tool stack.

India’s Slice Of The Downtime

For workplaces that rely on Outlook and Teams for daily operations, the outage translated into familiar disruptions: employees unable to access calendars, delayed client responses and teams switching to alternatives such as Slack, WhatsApp and phone calls to stay coordinated.

The disruption also spilled over into customer-facing services. IndiGo, India’s largest airline, said its email support services had been affected and that it might be unable to receive customer emails. 

Akasa Air reported delays in its email support services, advising passengers to contact its 24-hour Akasa Care Centre or reach out through social media for immediate assistance. Media reports also indicated disruptions at IT services companies, including Infosys and Cognizant.

The impact extended to business operations beyond communication. 

HR tech startup Keka told customers that the outage had affected services such as offer letter generation, scheduling one-on-one meetings, and interview scheduling and rescheduling. Equitas Small Finance Bank, meanwhile, asked customers to use its customer service helpline instead of email to reach the bank.

The outage is a reminder of how concentrated enterprise India’s software stack has become. A large share of Indian offices run their calendars, email, files and meetings entirely inside the Microsoft 365 ecosystem, a convenience that turns into a single point of failure the moment Exchange Online wobbles. 

“Businesses have a disaster recovery plan for servers, networks and data. Very few have one for the inbox, and the inbox is where contracts, approvals and payments actually move. Today’s Microsoft 365 outage shows email is a single point of failure that boards have never had to sign off,” said Amit Singh, practice head for managed services at WeP Solutions. 

It is also not an isolated event. Microsoft’s service-health page has logged a string of outages through 2026 alone, touching Azure, Teams, Copilot and Microsoft 365 at various points in January, May, June, July, August and October, well before this week’s episode. 

Each one has drawn fresh scrutiny of how much global and Indian enterprise IT now leans on a small number of hyperscale providers. That scrutiny is starting to translate into advice: analysts are increasingly telling Indian enterprises to treat multi-vendor redundancy as a backup email client, an alternate collaboration tool, contracts that do not assume round-the-clock uptime as a baseline requirement rather than a nice-to-have.

“My larger concern is not that Microsoft had an outage; outages are inevitable. It is that enterprises have progressively concentrated email, identity, collaboration, security, and now AI into the same cloud ecosystem. We have reduced application complexity, but inadvertently increased dependency concentration,” said Ritwik Batabyal, CTO at Mastek, a Mumbai-based digital and cloud transformation.

That is particularly relevant for India, where cloud adoption is accelerating rapidly. The answer is not an expensive multi-cloud copy of everything, but enterprises should identify their few “minimum viable business” capabilities—identity, critical communication, customer transactions and operational control—and ensure these can degrade gracefully or fail independently, he added.

On a side note, Microsoft offers uptime credits to eligible Microsoft 365 customers if monthly service availability falls below its contractual commitment of 99.9%. Depending on the extent of downtime, customers may qualify for credits of 25%, 50% or 100% of the monthly fee for the affected service. However, these are credits are subject to few conditions and is applicable only when the customer purchases products sold through the Cloud Solution Provider programme.  

Microsoft’s Restructuring

Microsoft’s latest workforce restructuring has also raised questions about whether cost-cutting could have implications for the reliability of its cloud services. 

The company recently confirmed that around 60,000 employees, or 27% of its global workforce, including those in India, are eligible for a voluntary exit offer, following a separate round of 4,800 job cuts in July. The company employs around 23,000 people in India across various products and roles. 

However, there is no evidence so far linking the workforce reductions to the Microsoft 365 outage. Microsoft has not attributed the disruption to staffing constraints, and its investigation into the technical cause is ongoing. 

The larger question is whether aggressive cost optimisation, even as Microsoft ramps up investments in AI infrastructure, could create operational risks for services used by millions of businesses. Already the outage has stretched into its second day, and if it goes on, this could be a real bodyblow to Microsoft and could hand a big piece of the enterprise productivity software business to its rivals.  

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