Create email address without a mailbox

Im curious how to create an email address for a security group without having to create a mailbox? Im asking this because it appears that this has been done on my Exchange server, and I dont know how it was done. I had a user try to open the groups calendar, and this is the error that was given: "the server mailbox cannot be opened because this address book entry is not a mail user"

When you click on Exchange Tasks, it gives only the option to "Delete Email Address".
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ademboAsked:
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aiailaCommented:
It is possible that this email address is a "distribution group" which mean that email is get distributed to the people in the list and doesn't have a mailbox or it is a contact email address where it is forwarded to some other address like Yahoo, comcast or someother email address. You can also create custom email address for one user by going to email address tab on the users properties in Active directory and that email address will also not have any mailbox.

Active Directory --> users OU --> select the user --> properties--> email address --> New --> SMTP address

I hope it helps..lets us know if thats what the case.

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ademboAuthor Commented:
It is a security group now... I guess it may have been created as a distribution group and then changed later to security group.

Thanks.
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