Delegate access is a feature for Exchange accounts that's allows a secondary Exchange account access to the e-mail, calendar, etc of the primary account. This feature may be useful for business partners, secretaries, etc that may need access to a primary account when that user is not able to access it him/herself.
It is possible to allow permissions for a delegate user to only view the calendar (or other select features) of the primary Exchange account or to even allow full access to select features or the entire account. Allowing the delegate full access allows them to not only view e-mails, the calendar, contacts, etc., of the primary account, but also modify them or send e-mail.
It is only possible to configure delegates using Microsoft Outlook or Entourage and can not be configured through the Web Portal (exchange.1and1.com).
Delegate users can now access this account's features through Microsoft Outlook or Entourage.