Failed to add distribution group to folder permission list

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  Hello,

  I have a small problem, and I cannot get my head around it. Maybe you have some hints.
  Also I didn't find it reported as a bug. Have you seen this before ?
   

  ENVIRONMENT:

  Exchange 2010 RTM Rollup 3
   
  STEPS performed
   
  1. I run the following command in order to give access to a security distribution group on the INBOX folder of the SHAREDMAILBOX mailbox.
  The command fails with the error below.
  I've run this several times. Same result.
   
  [PS] C:\>Add-MailboxFolderPermission -Identity SHAREDMAILBOX:\INBOX -User "THIS_IS_A_DISTRIBUTION_LIST@domain.local" -AccessRights 'Author'
  The user "THIS_IS_A_DISTRIBUTION_LIST@domain.local" is either not valid SMTP address, or there is no matching information.
      + CategoryInfo          : NotSpecified: (0:Int32) [Add-MailboxFolderPermission], InvalidExternalUserIdException
      + FullyQualifiedErrorId : 9ED408D2,Microsoft.Exchange.Management.StoreTasks.AddMailboxFolderPermission
   
   
   
  2. I added an additional e-mail address to that DL, without any underscores "_" and re-run the command.
  Surprisngly it worked !
   
  [PS] C:\>Add-MailboxFolderPermission -Identity SHAREDMAILBOX:\INBOX -User THISISADISTRIBUTIONLIST@domain.local -AccessRights 'Author'
   
  RunspaceId   : 5940edbd-651e-4d31-8a35-cac94146bdfa
  FolderName   : Inbox
  User         : THIS_IS_A_DISTRIBUTION_LIST
  AccessRights : {Author}
  Identity     : THIS_IS_A_DISTRIBUTION_LIST
  IsValid      : True
   
  3. I removed the permissions, using the e-mail address with underscores and it worked.
   
  [PS] C:\>Remove-MailboxFolderPermission -Identity SHAREDMAILBOX:\INBOX -User THIS_IS_A_DISTRIBUTION_LIST@domain.local
  Confirm
  Are you sure you want to perform this action?
  Removing mailbox folder permission on "SHAREDMAILBOX:\INBOX" for user "THIS_IS_A_DISTRIBUTION_LIST".
  [Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"):Y
   
  4. I re-run the command from point nbr 1 and now strangely it works !!!!
   
  [PS] C:\>Add-MailboxFolderPermission -Identity SHAREDMAILBOX:\INBOX -User "THIS_IS_A_DISTRIBUTION_LIST@domain.local" -AccessRights 'Author'
   
  RunspaceId   : 5940edbd-651e-4d31-8a35-cac94146bdfa
  FolderName   : Inbox
  User         : THIS_IS_A_DISTRIBUTION_LIST
  AccessRights : {Author}
  Identity     : THIS_IS_A_DISTRIBUTION_LIST
  IsValid      : True

  Thursday, March 3, 2011 5:44 PM