Article ID: 2555521 - View products that this article applies to.
In Microsoft Office 365, when you try to open Microsoft Outlook Web App by using a web browser such as Safari, you receive the following error message:
Cannot use this ID to access this service. Please sign-in with a different ID.
When you use Windows Internet Explorer, Outlook Web App opens successfully.
This issue occurs when you try to open Outlook Web App by using a URL that points to a site that requires Microsoft account (formerly Windows Live ID) credentials. And, this site doesn't accept a user ID. For example, you use the following URL:
To resolve this issue, use a URL that resembles the following to access Outlook Web App in Office 365:
For example if your domain is contoso.onmicrosoft.com, the URL that you'd use is as follows:
Still need help? Go to the Office 365 Community
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products