Microsoft Shares Recover After Premarket Plunge as Outlook Outage Ends
Microsoft shares swung from a sharp premarket plunge to a flat finish on Friday as the company’s Outlook email service came back online, ending a global outage that disrupted businesses, governments and schools in 74 countries for nearly a full day.
The stock fell as much as 2.9 percent in premarket trading on Friday morning, putting Microsoft on track at one point to lose more than $100 billion in market value, according to Dow Jones. By late morning, the shares had recovered most of the loss and were trading largely flat after Microsoft said email queues had returned to normal levels.
A rough open, then a recovery
Microsoft shares traded as low as about $508.51 before the opening bell, down 2.77 percent from Thursday’s close, according to Yahoo Finance data cited by FinanceFeeds. MarketWatch reported the stock dropped 2 percent in premarket trade, putting it on track for its lowest close since November 2 and its worst weekly performance since the week ending July 24.
The selling came on top of an already difficult stretch. The shares had fallen 4.45 percent over the two sessions before Thursday, when they recovered slightly to close at $523.00, up 0.36 percent. Microsoft had closed at $545.18 on Monday, November 9, after trading near record highs around $560 earlier in the autumn.
The recovery in the stock tracked the recovery in the services. TipRanks reported late Friday morning that Microsoft’s Outlook email service had started to bounce back, with email queues returning to normal levels, and that the shares were largely flat after the rebound. Microsoft warned that users might still see some intermittent delays during the day.
What went wrong
The disruption began at about 1 p.m. Eastern time on Thursday, November 12, when Exchange Online servers began failing automated health checks and dropping out of service, overloading the servers that were still running. The fault spread from Outlook to Teams, SharePoint Online, Microsoft 365 Copilot and other services in the Microsoft 365 suite.
Microsoft tracked the incident as EX1550543 for Exchange Online and MO1550821 for the wider suite. The company said the strain came from “a number of servers being unexpectedly unavailable,” with a core process on affected servers overwhelmed and causing capacity loss. It later narrowed the problem to the process responsible for establishing secure connections, and said a small number of configuration updates were under investigation as possible contributors.
Outage tracker Downdetector logged about 138,000 reports of Outlook problems at the peak, around 1:30 p.m. Eastern on Thursday, with reports reaching 74 countries and territories within about an hour. Microsoft said it had no indication the outage was the result of malicious activity, a point repeated by Charles Lamanna, the company’s executive vice president for Copilot, Agents and Platform, who wrote that there was “no indication this is the result of malicious or cyber activity.”
The damage on the ground
The outage was one of the longest in Microsoft’s history and the second disruption to its services this year, according to Insurance Journal. Businesses, government agencies and schools from Australia to the United States lost email and meeting tools for hours. Some organizations reverted to fax machines, and at least one bond repurchase in Europe was halted. Euronext, which runs exchanges in Paris, Amsterdam, Milan and four other cities, told listed companies to call by phone on urgent matters such as trading suspensions.
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Recovery proved difficult. Microsoft reported a partial recovery early Friday, but said it had “not been sustained,” and later acknowledged that its fixes were “not taking as expected.” The company extended the email timeout window to 48 hours so delayed messages would keep trying to reach their recipients while it cleared the backlog.
Why this matters
For investors, the episode landed at an awkward moment. Microsoft has been aggressively promoting Copilot, its AI assistant, as the centerpiece of its growth story, and the outage knocked out Copilot alongside the company’s core productivity tools. The stock was already under pressure from investor questions about rising infrastructure costs, competition from Anthropic and the profitability of cloud expansion.
The market’s verdict by Friday afternoon was measured. The shares’ recovery as services came back suggested investors treated the failure as an operational problem rather than a demand problem. Microsoft has promised a post-incident report once service is fully restored, and that report will be the next disclosure that can confirm or reverse the market’s calm reaction.
Latest developments
Microsoft said traffic was being gradually restored across its services on Friday and described recovery progress as encouraging. The company has not yet published a final root cause for the failure. Until it does, the precise trigger — and what Microsoft will change to prevent a repeat — remains unconfirmed.
Frequently asked questions
How far did Microsoft shares fall on Friday?
The stock fell as much as 2.9 percent in premarket trading, to about $508.51, before recovering to trade largely flat by late morning as Outlook service was restored.
How long did the Microsoft 365 outage last?
The disruption began at about 1 p.m. Eastern on Thursday, November 12, and ran for nearly a full day, with email queues returning to normal levels on Friday morning.
Was the outage caused by a cyberattack?
Microsoft said it had no indication the outage was the result of malicious activity. The company attributed the failure to server problems, with a core process overwhelmed and causing capacity loss.
Which Microsoft services were affected?
Outlook, Teams, Microsoft 365 Copilot, SharePoint Online and other Microsoft 365 services were affected, along with Exchange Online, the company’s cloud-based email and scheduling hub.
What to watch next
Investors will look for Microsoft’s post-incident report for a root cause and for any changes to how the company runs Exchange Online. The shares’ next test comes with the company’s next earnings report, expected around January 27, when Microsoft will have to show that the outage did not dent demand for its cloud and AI products.
Sources: MarketWatch via Morningstar; Dow Jones via Morningstar; TipRanks; Insurance Journal.
