Removing hub/cas server

Exchange 2010 sp3, 1 multi-role, 1 DAG (2 hubs, 2 mbs)
a few weeks ago, my DAG included the multi-role server. but due to hd space problems, i wasn't able to add more hd to the multi-role server. only to the 2 mb servers. therefore i removed the multi-role server from DAG membership.
the present DAG (2 hubs, 2 mbs), is working fine. my questions are:
will the multi-role server still be actively involved in the sending and receiving of emails? I've removed it from the send connector.
the multi-role server still shows in Server Configuration / Hub Transport. should i remove it?
EDIT: i will still be needing the multi-role server later on. maybe a few weeks from now.

If it doesn't contain any databases which holds mailboxes you can shut down the server and start the server when needed.
or if it contains database(with active mailboxes) move the mailboxes to active mailbox server(DAG member) and shutdown this server for time being if you wish to as it is not a member of DAG.
As commented above if you dont need it you should do a proper unisntall
MAS

Similar Messages

Exchange server 2010 Hub-Cas server role remove from organization

Dear all,
I am going to remove my one of my hub-cas(both the roles installed in same server)server from my organization.
Cas server configured into cas array. So anyone please guide me to remove safely.
Parthiban selvaraj

Hi,
From your description, I would like to clarify the following thing:
If you use NLB, you need to remove the CAS server from your NLB cluster and then remove this CAS&Hub server. If you use other sort of load balancer, you need to use it to remove the server from the CAS array and then remove the server.
Hope it helps.
Best regards,
Amy Wang
TechNet Community Support

Adding more ip address to a hub/cas server

Exchange 2010 sp3
i used to have a casarray but since my HUB2 went down, there is only one HUB1 left. also, something happened to the WNLB such that i have to shutdown the CASarray too.
now we have many applications pointing to the ip address of the CASarray and are failing because the ip is no longer online.
can i add the ip address of the downed CASarray to the remaining HUB1 server? are there any possible problems with that scenario?

Rather than adding new Array IP address point those Application to CAS servers and work on fixing the NLB issue.
I personally don't like WNLB.
I would suggest you to get Hardware Load Balancer to get rid of these kind of situation in future. You can also use HLB as reverse proxy too. There are many things HLB can do where WNLB can't even think about it.
KEMP Hardware Load Balancer is one of the best and Cheapest product available in the market.
Cheers,
Gulab Prasad
Technology Consultant
Blog:
http://www.exchangeranger.com    Twitter:
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

RE: Remove a CAS/HUB Exchange 2010 server from AD

Hello everybody,
i've an Exchange organisation that is composed of:
2 cas/hub servers in an array (cas1, cas2),
1 hub/fsw server (fsw)
2 MBX servers in a DAG (ex1, ex2)
one day i've decided to add an additional cas server (cas3) but some days later it falls down.
So i've decided to uninstall it from AD but i've deleted cas3 computer acccount from AD by mistake some days before. i want to uninstall this
exchange server from AD, i've tried to recover it in order to do clean remove but not successfully.
Please advise me, i really need help!!

The best available option you have at this point of time is to remove the server manually.
http://www.exchangeranger.com/2012/03/manually-uninstalling-exchange-server_01.html
No need to go for PSS support at this point of time, I am sure they will give the same as best available option as your objective is to remove the server.
Cheers,
Gulab Prasad
Technology Consultant
Blog:
http://www.exchangeranger.com    Twitter:
  LinkedIn:
   Check out CodeTwo’s tools for Exchange admins
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Can i use same certificate on 2 different CAS Server across sites

Hi All
I have a question I have been playing with for a few days,
I have the following setup,
2 sites connected via a VPN and a DAG configured between sites.
Site 1-Head Office
2 exchange 2010 servers,
1 running CAS and Mailbox (this server is entry point to all clients for owa etc.)
1 running Hub, CAS, Mailbox. (this is the main server and a DAG Member)
We have a UNC certificate associated with all records pointing to remote access and its installed on both servers.
** Everything in this site works fine.
** The AD DNS server does not have a zone for the public domain with all the external records only the .local domain. Planning to change this soon.
Site 2.
1 exchange 2010 servers,
1 running Hub, CAS, Mailbox. (this is the main server for this site, a DAG Member and no entry point at this time but we intend to use it for redundancy)
** Currently all BD are on server in site 1.
** The AD DNS server does not have a zone for the public domain with all the external records only the .local domain. Planning to change this soon.
My questions are as follows:
1      on site 2’s the cas server can I use the same certificate I’m using onsite 1. in other words all clients currently use mail.domain.com which has an IP pointing to site 1, can I use that same certificate in site 2 and associate
it with the CAS server there? (in the event of a failover I just change the records IP)
2      All smtp traffic come through site 1, when I test moving active databases to site 2, all email stay in the ques of exchange server in site one, they don’t get delivered. (I have not set AD replication through smtp so don’t know
if this is a factor)
3      When I do set the active databases to site 2, webmail and remote services stop working, I get the infamous error when logging onto webmail, service unavailable because it’s been moved. I have read a lot about this being an internal
external url issue.
All these issues im starting to think they all interlinked, and would like some help.
Cheers

Answers to your questions:
Yes. Understand that until you swap your external DNS so it points to Site 2, the mail.domain.com won't be accessed, but it will be there for when you want it to be.
AD replication is not the issue, so don't try to set it to use SMTP. If you have hub servers in both sites, your inbound Internet email should be delivered from the Site 1 hubs to the Site 2 hubs. We may need more information before we can give
you a good answer for this question. However, you may check the following TechNet article (and its links) for assistance.
http://technet.microsoft.com/en-us/library/aa998825(v=exchg.141).aspx
Web access requires that the CAS you connect to be either externally accessible and in the same site as your mailbox server, or that the CAS in the inaccessible Windows site needs to be configured as internal only and the accessible CAS needs to be configured
to proxy connections. For this, make sure you have followed the directions in the following TechNet article.
http://technet.microsoft.com/en-us/library/bb310763(v=exchg.141).aspx
HTH ...

Outlook won't connect to CAS server in another site

Hey guys, so heres my scenario, we were testing a primary site
dag outage, and not for all the tea in China would outlook connect to the DR sites CAS server. When I look at outlook its still trying to connect to the
cas server in my primary site, when I run the
autodiscover test from the clients outlook, within the output, I see it fails on the primary and goes to DR CAS as it should, I even did a repair and that didn't work.
i had to edit the host files on the client and point it directly
to the DR server and then it connected, and by that
i mean, it kept trying to connect to EX01 instead of DR01, so
i edited the host file to make the client go to DR01 as EX01, which
worked, so I'm not sure what's going on. All of this is internally btw.
Current design:
Exchange 2010 SP2 - 1DAG (3 members)
"Primary site": 2 DC's, 2 DAG members, 2 Hub/CAS
"DRSite"; 1DC (Alternatewitness), 1 DAG member running all roles
Testing server blackout scenario at the primary site, was able to get mailboxes mounted on DR site, OWA works, able to receive mail, outlook only works if DNS is reworked.
Thanks in advance for any suggestions.

Hey guys, finally got around to testing this, it
didn't work :(.
i built a lab with same versions and it worked automatically, the clients just connected
on their own.
anythingelse
I can check?
SIDENOTE: Not sure if related... i remember once
we had a problem where users could could not login to their mailbox using SITEA CAS servers when the databases were hosted in SITEB and in ADSIEDIT was made to allow this to happen, the change had us edit the CAS server's site so that instead of being in DRSITE
it was to SITEA. (Hopefully that makes sense can't remember exactly where that change was made in ADSI).

Mp_statusreceiver directory over 50GB - MP has been removed from this server, but not completely?

I had a server run out of disk space today. Digging in, the ccm mp_statusreceiver directory had 650,000 files in it, over 50GB in size. From what I understand, I think that folder is queuing up messages to go from a management point to the primary
server, but the server in question had it's management point removed a couple of weeks ago. It seems like it's still gathering data to send, but not sending it to the primary server, and filling up the drive.
If that's the case, then it seems the management point didn't actually get removed from the server, even though it's no longer listed in the config manager console as a management point. (The server still has a DP on it.)
How can I clean up whatever remnants of the MP are installed on this server?

Hi,
Yes, you need a path for mp.msi. I saw that is located at C:\Program Files\Microsoft Configuration Manager\bin\X64.
Best Regards,
Joyce
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are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Do i need a CAS server per AD site?

Hi!
So I have been browsing through a lot of Exchange Server documentation, guides and best practice but I have not found (or misunderstanding) the CAS placement for my situation.
We are currently in the process of upgrading to Exchange server 2013. As we have an Exchange 2003 only deployment, we will first need to move to Exchange 2010 and get rid of all the Exchange 2003 servers and then move on to Exchange 2013. We have a
single domain with 21 AD sites. 8 of these sites (Vessels at Sea) are connected by vSat the other 13 of these sites a remote offices with a more stable connection than vSat.
We want to have a MBX server at every site and what I get from the available documentation on the internet I will also need a HUB server per AD site. What I am not sure about is, do I also need a CAS server per site? What I get from this excerpt:
"A new service was introduced with Exchange Server 2010 to allow these MAPI connections to be handled by the Client Access
server. The RPC Client Access service provides data access through a single, common path of the Client Access server, with the exception of public folder requests, which are still made directly to the Mailbox server. This change applies business logic to clients
more consistently, and provides a better client experience when failover occurs." (ref Understanding RPC Client Access.), is that I also
need a CAS server per site.
Can somebody give me any definite insights in this one?
To summarize the question:
In a multi site AD with a MBX server per site, do I also need a CAS server per site?
Your help is much appreciated!
Regards,
Erik

(for Exchange 2010) You need CAS and Hub role in each site where Mailbox role deployed
Understanding Client Access
"You must install the Client Access server role in every Exchange organization and every Active Directory site that has the Mailbox server role installed"
Overview of the Hub Transport Server Role
"You must deploy a Hub Transport server role in each Active Directory site that contains a Mailbox server role"
Blog - Smtp25.ru

Deploying 2x Exchange Server 2013 CAS server email traffic high availability during patching & reboot

Hi people,
What is the best way to utilize VMware technology to host 2x the Exchange Server 2013 CAS role VM in my production VM to ensure that the email traffic is not halted during server patching ?
Previously in Exchange Server 2007 I am using Windows NLB (IGMP Multicast) on my ESXi 4.1, now with ESXi 5.1 and 2013 I wonder if there is any better way to make sure that the server failover does not disrupt the mail flow between the Smarthost and the CAS server role.
Thanks

Hey AlbertWT,
Can you clarify exactly what you mean when you say "server patching?" Do you mean patching at the ESXi host level or something within the guest?
As you probably know Exchange 2013 CAS no longer needs NLB or even a hardware load balancer. Due to changes in the architecture, even simple DNS round robin is "enough" to load balance the CAS role. NLB has its own set of headaches which you are probably all too familiar with so getting rid of that can help remove a lot of complexity from the situation.
If you can clarify what you mean by "server patching" and "server failover" in your post I think that would be helpful for me to give you a more definitive answer.
Matt
http://www.thelowercasew.com

Exchange server 2013 CAS server high availability

Hi
I have exchange server 2010 sp3(2 MB, 2Hub/Cas) servers.
Planning to migrate to exchange server 2013.( 2 cas servers and 2 mbx servers).
I dont want to go all traffic single so i am keeping the role separate..
In exchange 2010 i achieved hub/CAS high availability through NLB.
In exchange 2013 how to acheive this...
Please share your suggestions with document if possible...

Here ya go:
http://technet.microsoft.com/en-us/library/jj898588(v=exchg.150).aspx
Load balancing
and
http://technet.microsoft.com/en-us/office/dn756394
Even though it says 2010, it applies to 2013 vendors as well.
Twitter!: Please Note: My Posts are provided “AS IS” without warranty of any kind, either expressed or implied.

Hub Transport Server

Dear All,
I have 2 mailbox servers which are in DAG with one HUB transport server it's working fine .
I have a problem with Hub transport server .If we shutdown Hub transport server the exchange mail users they can't login to email . how can we solve this ? or can i create another one Hub transport ? or which one best for
Usss.
I am waiting .
Regards
Subash

Hi Subash,
I suggest you install one HUB+CAS and configure CAS array to load balance your CAS servers.
http://blogs.technet.com/b/ucedsg/archive/2009/12/06/how-to-setup-an-exchange-2010-cas-array-to-load-balance-mapi.aspx
CAS Array will not load balance by itself you should have a load balancer. It is an object in AD. Please read this to understand about CAS array. http://exchangeserverpro.com/exchange-server-2010-cas-array/
If you have a load balancer it will load balance both HUB and CAS.
if you don't have budget for load balancer you can go with DNS RoundRobin which is not an automatic failover system. Please read these. Threads discussing about DNS RoundRobin and CAS array.
1.https://social.technet.microsoft.com/Forums/exchange/en-US/f0f591d2-90cd-4a8b-9c42-a0e4d1304567/cas-array-and-dns-round-robin
2.http://smtp25.blogspot.com/2012/01/exchange-2010-cas-array-simple-dns.html
Thanks, MAS
Please mark as helpful if you find my comment helpful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

Cas server uninstall failed... Now how to reinstall?

Ok, here is the scenario a company set up an exchange server and IIS config got damaged. So I followed the microsoft guide on uninstalling IIS then the cas server only problem was the cas fail the uninstall about half way through now I can't uninstall
or reinstall.
Also can't reinstall the OS....
Any Ideas.
Output from installer:
Client Access Role
Failed
Error:
The following error was generated when "$error.Clear();
          $CommandAppCmd = join-path $env:SystemRoot System32\inetsrv\appcmd.exe;
          Start-SetupProcess -Name "$CommandAppCmd" -args "uninstall module exppw";
        " was run: "Process execution failed with exit code 1168.".
Process execution failed with exit code 1168.
Click here for help...
http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex88D115&l=0&cl=cp
Elapsed Time: 00:00:01
Thanks in advance

Sadly the guys that own the server only have the one and won't let anyone onsite on the weekends but they don't want downtime so basically they want the
perfect server!
Original Log:
# Component tasks
# Tasks for 'All Roles Common Last' component
# [ID = AllRolesCommonLast___25c25f6a6e484b32bedc5d6fa5ea3699, Wt = 1, isFatal = True] "Creating the Exchange server configuration object in Active Directory."
5/12/2010 12:50:07 AM:remove-InstalledRoleInfo -RoleName $RoleRoleName
# [ID = AllRolesCommonLast___6f2b6624392e4f678c9b5a386a4916ae, Wt = 1, isFatal = True] "Creating the Exchange server configuration object in Active Directory."
5/12/2010 12:50:07 AM:
          if ($RoleRoles)
            & $RoleBinPath\ServiceControl.ps1 EnableServices $RoleRoles.Replace('Role','').Split(',')
# [ID = AllRolesCommonLast___f688defc7999417ba5c8e7b4ca41a971, Wt = 1, isFatal = True] "Creating the Exchange server configuration object in Active Directory."
5/12/2010 12:50:07 AM:
          & $RoleBinPath\ServiceControl.ps1 EnableServices $RoleRoleName.Replace('Role','')
# [ID = AllRolesCommonLast__StartWinMgmt, Wt = 5, isFatal = True] "Starting the WMI service."
5/12/2010 12:50:08 AM:
          if (Get-Service WinMgmt* | ?{$_.Name -eq 'WinMgmt'})
            Set-Service WinMgmt -StartupType Automatic
            Start-SetupService -ServiceName WinMgmt
# [ID = AllRolesCommonLast__StartRemoteRegistry, Wt = 5, isFatal = True] "Starting the Remote Registry service."
5/12/2010 12:50:08 AM:
          if (Get-Service RemoteRegistry* | ?{$_.Name -eq 'RemoteRegistry'})
            Set-Service RemoteRegistry -StartupType Automatic
            Start-SetupService -ServiceName RemoteRegistry
# Tasks for 'File distribution Service Control' component
# [ID = FileDistributionServiceControl___474b4dc5deb44f7ca748da725a0ecac3, Wt = 1, isFatal = True] "Stopping the Microsoft Exchange File Distribution service."
5/12/2010 12:50:08 AM:stop-SetupService -ServiceName MSExchangeFDS
# Tasks for 'RPC Client Access Service Control' component
# [ID = RpcClientAccessServiceControl___4b4248cce65c4ccaa92fe5f938f2aedc, Wt = 1, isFatal = True] "Stopping Microsoft RPC Client Access."
5/12/2010 12:50:10 AM:stop-SetupService -ServiceName MSExchangeRPC
# Tasks for 'Client Access Service Control' component
# Tasks for 'File Distribution Service Configuration' component
# [ID = FileDistributionServiceComponent___659b38f67e0240199f57f0c851fe7a2b, Wt = 1, isFatal = True] "Uninstalling the Microsoft Exchange File Distribution service."
5/12/2010 12:50:11 AM:uninstall-FileDistributionService
# Tasks for 'File Distribution Service Group Metrics Perf Counters' component
# [ID = FDS_GM_PerfCountersComponent___8c292d9c21af44358441a4c99baddeab, Wt = 1, isFatal = False] "Installing FDS GM PerfCounters."
5/12/2010 12:50:16 AM:remove-perfcounters -DefinitionFileName FDSGMPerformanceCounters.xml
# Tasks for 'File Distribution Service OAB Perf Counters' component
# [ID = FDS_OAB_PerfCountersComponent___103a4c1adf974591be38633f58ec1ebc, Wt = 1, isFatal = False] "Installing FDS OAD PerfCounters."
5/12/2010 12:50:17 AM:remove-perfcounters -DefinitionFileName FDSOABPerformanceCounters.xml
# Tasks for 'Enable RPC over HTTP redirector firewall exception' component
# [ID = RpcHttpRedirectorException___653184838b334e749dbc87a567e865b2, Wt = 1, isFatal = False] "Configuring the server."
5/12/2010 12:50:17 AM:
          if ([Environment]::OSVersion.Version.Major -ge 6)
          Remove-FirewallException -FirewallRule (New-Object Microsoft.Exchange.Security.WindowsFirewall.RpcHttpRedirectorRule)
# Tasks for 'Address Book Service Configuration' component
# [ID = AddressBookComponent___fe2c1cbb8e954dd786870cdc8b3d85e9, Wt = 1, isFatal = True] "Configuring the Microsoft Exchange Address Book service."
5/12/2010 12:50:17 AM:uninstall-AddressBookService
# Tasks for 'RPC Client Access Protocol Configuration' component
# Tasks for 'Client Access Services Configuration' component
# [ID = ServicesComponent___ca981854eaa74c1ca684178d9ea52fff, Wt = 1, isFatal = True] "Configuring Client Access services."
5/12/2010 12:50:23 AM:
     get-WebServicesVirtualDirectory -Server $RoleFqdnOrName -DomainController $RoleDomainController | remove-WebServicesVirtualDirectory -DomainController $RoleDomainController -Force;
# [ID = ServicesComponent___98bb14bb96bc43babb98f8d36183263e, Wt = 1, isFatal = True] "Configuring Client Access services."
5/12/2010 12:50:24 AM:get-ActiveSyncVirtualDirectory -server $RoleFqdnOrName -DomainController $RoleDomainController | remove-ActiveSyncVirtualDirectory -DomainController $RoleDomainController
# [ID = ServicesComponent___9b5feb8e2ff64c4ebd10edb43c3a2aa9, Wt = 1, isFatal = True] "Configuring Client Access services."
5/12/2010 12:50:26 AM:
     $clientAccessServer = get-ClientAccessServer -Identity $RoleFqdnOrName;
     if($clientAccessServer)
         if(($clientAccessServer.AutoDiscoverServiceInternalUri) -and ($clientAccessServer.AutoDiscoverSiteScope))
      set-ClientAccessServer -Identity $RoleFqdnOrName -AutoDiscoverServiceInternalUri:$null -AutoDiscoverSiteScope:$null
# [ID = ServicesComponent___a8409d9e1e024948a9cf2805368de7dd, Wt = 1, isFatal = True] "Configuring Client Access services."
5/12/2010 12:50:27 AM:get-AutodiscoverVirtualDirectory -Server $RoleFqdnOrName -DomainController $RoleDomainController | remove-AutodiscoverVirtualDirectory -DomainController $RoleDomainController
# Tasks for 'RPC-over-HTTP Proxy Configuration' component
# Tasks for 'ECP Configuration' component
# [ID = ClientAccessEcpComponent___9b61914c88354a1ca625560e0a59451c, Wt = 1, isFatal = True] "Installing/Removing the ECP component."
5/12/2010 12:50:28 AM:
          get-EcpVirtualDirectory -server $RoleFqdnOrName -DomainController $RoleDomainController | remove-EcpVirtualDirectory -DomainController $RoleDomainController;
# Tasks for 'OWA Configuration' component
# [ID = ClientAccessOwaComponent___5effe7121e1740c083904cc189687464, Wt = 1, isFatal = True] "Installing/Removing Outlook Web App Component."
5/12/2010 12:50:29 AM:
          $CommandAppCmd = join-path $env:SystemRoot System32\inetsrv\appcmd.exe;
          Start-SetupProcess -Name "$CommandAppCmd" -args "uninstall module exppw";
Current Log:
# Component tasks
# Tasks for 'OWA Configuration' component
# [ID = ClientAccessOwaComponent___5effe7121e1740c083904cc189687464, Wt = 1, isFatal = True] "Installing/Removing Outlook Web App Component."
5/12/2010 1:59:07 AM:
          $CommandAppCmd = join-path $env:SystemRoot System32\inetsrv\appcmd.exe;
          Start-SetupProcess -Name "$CommandAppCmd" -args "uninstall module exppw";
Any Ideas?

Removing the "target server" from process chain jobs

Dear SAP Community,
Please note we are on BW version 3.5
We have a very large number of process chains that are used to load data in the production environment. Many of those process chains have a "target server" specified, so that the jobs will run only on the central instance.
A new application server has just been added to the environment, and we want to remove the "target server" definition so that the dispatcher will be free to load balance the process chain jobs.
We can see the attributes for each process chain are stored in a table called RSPCCHAINATTR.
Please let me know: can we update the value of field SERVER in table RSPCCHAINATTR, to set it to blank using SQL-PLUS ?
And then can we run a /$sync to bring these changes up into the application layer ?
This would save tons of time & manual effort, and it would set the target server to blank for all of the process chains at once, instead of clicking manually so many times to clear the value for each process chain.
Please let me know if we can take this approach ? Is there any chance of the process chains becoming inactive by doing this ?
We want to set the "target server" = blank in all cases, instead of manually clicking into each and every process chain.
Please let me know, thanks.
Keith Helfrich
Edited by: Keith Helfrich on Aug 17, 2010 11:45 AM

Check tcode RSBATCH, If I'm not wrong all process types are assigned to central server. Remove that server name and save.
Now, If u execute process chain, system will prompt you assign server/host name. To skip this follow the below.
Again use RSBATCH, under 'Background and Parallel Processes' tab, click 'Switch Off F4 Popup for Server/Host/Group', enter * (star) under Users for 'Users for Whom NO Server/Host/Group Popup Should be Processed'.
Now, If u execute process chain, it should run on either of servers.
Since u added Appln Server, best bet would be creating a server group. See the below link.
How to run Process Chain jobs WITHOUT a target server

Connecting CAS Server to Mailbox Server in Exchange 2010

Currently, we are running the CAS,HUB,and Mailbox role on the same Exchange 2010 SP3 server. At some point I would like to separate this out. Should be an easy question: what command gets/sets the settings which points a CAS array to a mailbox database?
So I want CAS_SERVER1 -> DB1,DB2 and CAS_SERVER2 -> DB3,DB4

Hi,
In Exchange 2010, Outlook look for the “rcpclientaccessserver” attribute on the user’s Database to find the CAS server. You can manually set it by the following command:
Set-mailboxdatabase –rcpclientaccessserver xxx
Thanks,
Simon Wu
TechNet Community Support

Remove copy from server 'when moved from inbox' option for POP accounts

Is this option supposed to work in all cases? (or could it be buggy?:-)
I can't get it to work with my POP account: messages are still left on the POP server, even after when they are moved from the inbox to another local mailbox on my Mac...
Manual selective removal of messages from the server does work (thru the 'Get info' window of the 'Gear' menu at bottom of Mailboxes pane), so this does seem to be a problem with the POP server.
Or do I by any chance misinterpret the meaning of this option?
PowerBook G4 Mac OS X (10.4.7) Mail version 2.1 (752/752.2)

You've interpreted correctly how it should work, as long as you take the following considerations into account:
1. Messages aren't supposed to be removed from the server immediately, but rather the next time Mail connects to the POP server.
2. It may have no effect on messages that had already been downloaded prior to you choosing that option.
And, yes, it sometimes doesn't work as expected. It could be buggy or Mail might have problems communicating with the server.

Removing hub/cas server

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