We have a few clients that would like to see their Domain Calendar in Outlook calendar or in  iCalendar.  I set up our own domain with a shared Domain Calendar.  In Smartermail, web version, I can see the shared domain calendar, and can add events and appointments to the Domain Calendar. When I am on my IPHone I can see the domain calendar items and create new items as well.

However, I am unable to see the shared Domain Calendar when using either Outlook or iCalendar.  

I have tried both IMAP and Exchange set up for the email and neither one sees the shared domain calendar.  

When I try to add a shared calendar it ask for a username and password, which does not exist as this is at a domain level shared with users. When trying to use my email address as the user it throws an error.  

What am I missing?

Our clients would like to be able to use iCalendar or Outlook to add items to the Shared Domain Calendar.  Right now the only way to do this is with Webmail or their phone.

Thank you.