Symptoms

When you press the Enter key on the keyboard to sign in Outlook Web App in a Microsoft Exchange Server 2013 environment, the sign-in form is submitted two times. This may cause unnecessary memory consumption on the Client Access server. 

Cause

This issue occurs because it is a designed function in Exchange script.

Resolution

To resolve this issue, install the following cumulative update:

2961810 Cumulative Update 6 for Exchange Server 2013

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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