Microsoft Stock drops 25% as Copilot adoption and Azure backlog raise questions

Monday at 9: 30 a. m. ET, microsoft stock was being weighed down by a confirmed 25% drop from its all-time high, even as Microsoft described continued momentum in Azure and expanding use of its AI assistant Copilot. The unresolved issue for investors is whether Copilot adoption meaningfully accelerates and how Microsoft’s $625 billion backlog—especially the portion tied to OpenAI—ultimately holds up when customers’ commitments come due.

Microsoft Stock and the confirmed drivers behind the recent sell-off

Microsoft’s cloud platform Azure is described as consistently the fastest-growing piece of the company’s overall business, and many customers use Azure’s computing capacity to develop and deploy artificial intelligence software. Microsoft also has embedded its AI assistant Copilot into flagship products including Windows, Bing, and 365, which includes Word, Excel, and Outlook.

Still, the sell-off in microsoft stock has been tied in part to investor focus on Copilot adoption. Copilot represents a “massive financial opportunity” for Microsoft, but adoption has been modest so far, which has contributed to the decline in the stock price. The confirmed price move is that Microsoft stock is down 25% from its all-time high and has not been this cheap in more than three years.

Copilot for 365 license penetration and the measurable adoption gap

Copilot can be used as a regular chatbot and also as a productivity tool when packaged with enterprise software. While anyone can use it for free through Windows or Bing, Microsoft charges a fee when businesses want to embed it in the 365 application suite.

Microsoft’s addressable market is large: companies currently pay for over 400 million 365 licenses for employees globally. Yet as of Microsoft’s fiscal 2026 second quarter, which ended Dec. 31, businesses had bought only 15 million Copilot licenses for 365. That implies a penetration rate of 3. 7% based on the figures provided.

There are also confirmed signs of improving usage metrics even with that modest penetration. The number of Copilot for 365 licenses grew 160% year over year. Microsoft also said the number of businesses with more than 35, 000 Copilot for 365 licenses tripled during the quarter, while daily active users rose tenfold. Those data points support a confirmed pattern: once businesses adopt Copilot, they can expand it to more employees and increase usage over time.

What remains unresolved is whether that trajectory translates into sustained, broad-based buying across the installed base of 365 customers rather than concentrated growth among early adopters. The observable data that would clarify the picture is the next disclosed count of Copilot for 365 licenses and any updated penetration calculation against the stated base of 400 million-plus 365 licenses.

Microsoft’s $625 billion backlog and the OpenAI concentration question

AI development often takes place in data centers that require large numbers of specialized chips, and the infrastructure to support that can cost billions of dollars to build. That cost profile is one reason developers rent computing capacity from cloud providers such as Microsoft Azure rather than building everything themselves.

As of Dec. 31, Microsoft had a confirmed $625 billion order backlog from customers waiting for more data centers to come online, an increase of 110% year over year. Microsoft has also invested $118 billion to build more infrastructure over the last four quarters and said it will spend even more going forward.

Yet, a key risk is the makeup of that backlog. A confirmed 45% of the backlog—$281 billion—is attributable to OpenAI alone. OpenAI was described as having around $20 billion in annualized revenue at the moment, and it recently secured $110 billion from investors in a capital raise. Even so, the context presented raises a concern that this funding still would not be enough for OpenAI to fulfill its obligations to Microsoft, let alone other cloud providers with large commitments.

That leaves investors watching for observable signals about whether Microsoft’s backlog ultimately converts into delivered capacity and revenue as expected, especially for the portion tied to OpenAI. The clarifying events are Microsoft’s future disclosures about backlog composition, the pace at which new data centers come online, and any updated characterization of customer commitments related to OpenAI.

For now, the next confirmed milestone to watch is Microsoft’s next set of reported results following its fiscal 2026 second quarter ended Dec. 31, when the company can update investors on Copilot for 365 license counts, daily active users, and the size and concentration of the $625 billion backlog. If Microsoft confirms a meaningful increase from 15 million Copilot for 365 licenses while keeping backlog conversion on track, investor expectations for the trajectory of microsoft stock are expected to hinge on those updated figures rather than the prior 25% correction alone.