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In Outlook 2010, some internal recipients receive an Internet Connection Sharing file instead of a Calendar Sharing message
Article ID: 983062 - View products that this article applies to.
Consider the following scenario :
Some contacts that are listed are internal to your intranet and to your Exchange servers. However, these contacts are listed together with their external address and not with their internal account name.
If you click Yes, you receive the following prompting message:
If you click OK, an email Calendar Sharing message is created that contains an Internet Connection Sharing attachment that contains the calendar data. However, the Internet Connection Sharing file does not let internal recipients share your calendar through the Exchange server. The Connection Sharing file provides only a copy of your calendar's information.
This issue occurs when an internal recipient is also in your Contacts list in Outlook 2010. When you add this recipient to a Calendar Sharing message, the autocomplete feature of Outlook 2010 adds the recipient to the recipient list by using the recipient's external email address.
For example, a recipient has the Exchange alias User1. When you add them as a recipient to the Calendar Sharing message, their address is displayed as User_name (User1@contoso) and not as User_name.
To work around this issue, select internal recipients directly from the global address list. To do this, follow these steps: