Follow the steps below to log in to XAdmin to manage your Microsoft Exchange 2007 account.
In your browser, navigate to the 1&1 Exchange account login at http://exchange.1and1.com/
At the bottom of the login screen will be a link for XAdmin. Click the link to be taken to the XAdmin login page.
Click the XAdmin link
Use your 1&1 Exchange e-mail address and the account's password in the respective fields. Click the Log On button to log in to XAdmin.
Input your credntials and click Log On
You can now begin management of your Exchange account from XAdmin.
You are logged in to XAdmin
For additional information, you may want to reference: