Microsoft’s official website microsoft.com is down for many users worldwide. When visited, users were presented with the following error message.

Your request has been blocked. This may be due to several reasons.

Microsoft also listed the following possible reasons:

• You are using a proxy that is known to send automated requests to Microsoft. Check with your network administrator if there is any proxy and what User-Agent they are sending in the request header.
• Your request pattern matches an automated process. To eliminate, reduce the volume of requests over a period of time.
• Reference ID: 18.3ccd3d17.1604507046.78b1d9dd

Update: Microsoft.com is now accessible to everyone worldwide.