The solution is to create a wrapper web part around the OWA web part out of the box and access your inbox using the currently registered user as the destination user.
Here is the code
PS (note that the web access address is set in the settings here!)
using System; using System.Configuration; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using Microsoft.SharePoint; using Microsoft.SharePoint.Portal.WebControls; namespace DCubed.SharePoint.WeParts {
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