Have you been having problems with your Outlook email account? Here is why
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Those attempting to log in on Tuesday evening were met with error messages indicating that the service was unavailable.
The technology giant said users were also having difficulty signing into its Xbox Live gaming service, but later reported that the issue was fixed.
A message on the company's service status website said the fault had left people unable to access Outlook.com services.
As of Wednesday morning, the company said: "Our continued monitoring indicates that the majority of users have successfully recovered access to the affected
Outlook services, however we're still seeing reports of intermittent issues for a small subset of users.
"We're working on narrowing down the root cause of the issue to help mitigate impact for those still affected."
The popular Outlook.com platform supports Outlook, Hotmail and Windows Live email accounts.