SBS 2011 Migration - which security groups and users - part 2

I posted a question about migrated security groups, see http://social.technet.microsoft.com/Forums/en-US/smallbusinessserver/thread/53c89c2b-fd20-4a1d-8264-badaf1ea9827 (migration of SBS 2003 to SBS 2011).

That question was about security groups in AD > MyBusiness > Security groups. When I look in AD under Users (AD > Users) I see a bunch of migrated users and security groups as well. They can easily be found by looking at their creation date. Again I wonder if those groups and users are still needed in SBS 2011? They are:

• Certificaatuitgevers (certificate publisher) members: <domain controller>
• DHCP-administrators (mind the hyphen) members: none
• DHCP-gebruikers (DHCP-users) members: none
• DnsAdmins members: none
• HelpServicesGroup members: SUPPORT_388945a0
• IIS_WPG  members: IWAM_<old SBS 2003 server>; local service; Network service; Sharepoint Administrators; Sharepoint Farm account; System; Windows SBS internal Web site account
• OWS_3759772115_admin  members: none
• RAS- en IAS-servers  members: none
• SQLServer2005MSFTEUser$<old SBS 2003 server>$MICROSOFT##SSEE  members: none
• SQLServer2005MSSQLServerADHelperUser$<old SBS 2003 server>  members: none
• SQLServer2005MSSQLUser$<old SBS 2003 server>$A2ESQLSERVER member: add2exchange
• SQLServer2005MSSQLUser$<old SBS 2003 server>$MICROSOFT##SSEE  members: none
• SQLServer2005SQLBrowserUser$<old SBS 2003 server>  members: none
• STS_WPG  members: sharepoint administrators
• TelnetClients  members: none
• WINS-gebruikers (WINS-users)  members: none
• WSS_ADMIN_WPG members: Administrator; Sharepoint Farm Account
• WSS_RESTRICTED_WPG  members: none
• WSS_RESTRICTED_WPG_V4 members: Sharepoint Farm account
• WSS_WPG  members: Sharepoint Farm account; Sharepoint Search Service account; Windows SBS Internal Web site account
• WSUS-administrators  members: none
• WSUS-reporters  members: none
• WSUS Administrators  members: none
• WSUS Reporters  members: none
• DnsUpdateProxy  members: none
• Exchange Domain Servers  members: none

And then there are a couple of users:

• IUSR_<old SBS 2003 server> member of: domainusers; guests
• IWAM_<old SBS 2003 server>  member of: domainusers; IIS_WPG
• krbtgt member of: Domainusers; Denied RODC Password Replication Group
• MDT member of: Domainusers
• SQLAdmin member of: Administrators; Domainusers
• SUPPORT_388945a0  member of: Domainusers; HelpServiceGroup

Simon