You have just signed up for a Synchronizer account, and you are using a (hosted) Exchange account but for some reason, the authentication fails on step 2 during the Wizard.
This happens when there is a misconfiguration regarding the Autodiscovery. In some special situations (hosted Exchange), Autodiscovery might not be available (always ask your (local) IT first).
If Autodiscover does not work, please see this article.
To get it to work we need the following information:
This is needed to communicate with the mailboxes (KB article).
This is needed to link the SuperOffice users with the Exchange/Outlook users (KB article).
This is needed for authentication on the Exchange environment (KB article).
This is needed for authentication on the Exchange environment (KB article).