After running the DigaMailbox IP Depot 1.x setup you would normally start configuring the mailbox using the UpdateManager.
After running the UpdateManager it could happen that DigaTrans IP could connect but you won't get access to the website.

To solve this problem you need to run the Ajax setup which is part of the setup package. You can run it from C:\Program Files\DigaSystem\MailboxDepotInstall\Ajax\ASPAJAXExtSetup.msi
After finishing the setup you must restart the computer to finish the installation.

Now the website should be displayed correctly.