Hi there! I have setup a Exchange 2010 server to host multiple organisation's email requirement. The server is solely for Exchange and has a forest and a exchange domain in it just for exchange server. However, I notice that there can only be one "Organizational Unit", which is my hostname, server.mydomain.com in this server. I am not very sure what is the meaning of "Organizational Unit", does it refers to the name of a server? Because I notice all Users mailbox created is all under server.mydomain.com/Users. What I want to do is to "partition" it so that different mailboxs from different organisations will be created and grouped together for collaboration purposes, so that a user from his organisation would not be able to find out any information or see another user from another organisation. Can anyone advise how can this be done? Thanks so much! :)Jackson Yap APC Hosting http://www.apc.sg/

Hi, Organizational units are created and managed in Active Directory, you can create and organiza them as you wish. Other than that it sounds like a hosted environment, but I haven't seen the final paper from Microsoft about addresslist segregation. I do know that they have moved away from the normal hosting solution after Exchange 2010 SP1 came, but I haven't read the papers on it yet or seen if they are published. /MartinExchange is a passion not just a collaboration software.

Yep! Thanks, that means even they are different organisation unit, there is no way to have complete segregation in Exchange 2010 currently?Jackson Yap APC Hosting http://www.apc.sg/

That's correct, there is no currently supported solution to implement address list segregation with Exchange 2010. http://blogs.msdn.com/b/dgoldman/archive/2010/09/09/the-future-of-exchange-2010-address-list-segregation.aspx Cheers, Eric Tam [MSFT]

Because I am wondering how some companies hosting Exchange server do it? They are offering like 5 CAL license, 10 CAL Licenses etc Exchange packages.. that means different organisations will see all the address list? Or do they just have a customized solution around that?Jackson Yap APC Hosting http://www.apc.sg/

It's possible to use either on Exchange 2010 SP1 "Hosting Mode" or on Exchange 2007 HMC . There is also a dedicated forum on technet for Exchange 2010 hosted and a few technet blog articles around pertaining to setup . If you want to continue with the current setup, I think the only easy option for preventing clients from seeing one another (because Address List Segregation isn't available) is to hide each mailbox from address lists. It has the side effect that users in each org cannot see each other either, of course. SteveSteve Goodman Check out my Blog for more Exchange info or find me on Twitter

Thanks Steve! Then that won't be a good option since I will want users to be able to collaborate among their company for emails and calendar. Most likely I will need to install with the hoster option. Is the only way to reinstall by reloading the OS and install Exchange once again with hosting option? Btw from the wiki, what do you mean by "deployed using the "/hosters"" ? And one last time to clarify. From what I have read, hosting option does not have EMC right? Then how could one be possible to create various organisations in Exchange who are using the mail server? Will it be difficult?Jackson Yap APC Hosting http://www.apc.sg/

Hi Jackson, The /hosters is a command line switch during setup. If you have installed a fresh AD and Exchange for this then it may be worth starting from scratch, as it's not just an Exchange install; it also creates an Exchange organisation in AD as part of the setup of the first server. You are right, the hosting option doesn't have the Exchange Management Console. You have to use Exchange Management Shell to manage the environment. However, IIRC, you can delegate the management of mailboxes to each tenant admin (ie let the customer manage their mailboxes). SteveSteve Goodman Check out my Blog for more Exchange info or find me on Twitter

Thanks so much Steve! :) Really learn alot from here. That's to say, to include both /hosters and /hosting parameter when installing in "Hosting Mode"?Jackson Yap APC Hosting http://www.apc.sg/

Hiya, I'd take a look at these articles here - starting at Hosting Deployment Part 1, down at the bottom, will give you a short overview of the setup and management process. Also, the licensing for hosters is different to normal Exchange. SteveSteve Goodman Check out my Blog for more Exchange info or find me on Twitter