Article ID: 2555521 - View products that this article applies to.
Not sure what release of Office 365 you're using? Go to the following Microsoft website:
Am I using Office 365 after the service upgrade?
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
Article ID: 2555521 - Last Review: May 31, 2013 - Revision: 16.0