Microsoft's Outlook, SkyDrive, and People technologies are experiencing problems, making it difficult for some people to access the cloud services.
The issues began on Wednesday morning and affected Microsoft's hosted storage, email and contact services. Its Azure cloud coincidentally reported problems for SQL databases in the North Central US data center region.
"Microsoft is investigating an issue affecting a small number of customers' access to some Outlook.com and SkyDrive experiences and we are working to restore full access to the services as quickly as possible. For the latest information, we encourage people to visit the status page," Microsoft said in a statement given to ZDNet The Register.