SBS 2011 Groups not removing e-mail groups

If I change the name* of an e-mail distribution group from allusers@ to say users@ it creates the new group but doesn't delete the old one. Where do I do this? And is allusers@ a reserved e-mail address?

* In "Windows SBS 2011 Standard Console"/Users and Groups/Groups/E-mail Distribution Groups

Many thanks, EH
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This is likely to be a cache issue:

1.Open a new email message.
2.Type the first few characters of the nickname cache entry that you want to remove from the cache.
3.When the entry appears in the list of suggested names, move your mouse pointer over the name until it becomes highlighted, but do not click the name.
4.When the “X” icon appears next to the highlighted name, click X to remove the name from the list.
Imtiaz HashamTechnical Director / IT ConsultantCommented:
AllUsers is a default built-in account and on an SBS, may I suggest don't change this.  Create a new dynamic group called

@Unknown_Routine: As I understand, this issue is not on the Outlook but on the Exchange Server itself.
edhastedAuthor Commented:
Fine, but being on a network how do I ensure all users no longer have access to that email address?

Imtiaz HashamTechnical Director / IT ConsultantCommented:
Hi Ed,

Please try to disable the AllUsers as you can't hide a distribution group!

1. Go to Exchange Management Console
2. Expand Recipient Configuration
3. Click on Distribution Group
4. Disable All Users

Run BPA to ensure everything is fine!

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