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Separating Address Lists in Exchange 2010 SP2

We will soon be standing up exchange 2010 SP2 along with a partner running the same version. We will be using some kind of GAL sync so mailboxes in the partner org show up in our GAL, I am guessing as Contacts. The problem is we don't want our GAL flooded with 10's of thousands of entries as this will be confusing for users. We want separate GALS for each org and each user on our side must be able to select which GAL they want when sending an email. At this time, I am not concerned about the other Org. Since we have far less users, they will probably do nothing.  Basically, our GAL should be the default and if they want to send to the other Org, they can select that GAL in Outlook. I was reading up on ABP but I am not sure if that is what I want here because it appears you can assign only on ABP per mailbox and we don't want to restrict users from accessing a GAL. We just want them separated. What is the best way to do this?

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Manpreet SIngh Khatra

8/22/2022 - Mon
Manpreet SIngh Khatra

As you say for Seperated GAL's .... that simply is like a GAL for set of users nothing like multiple GAL for all users .... makes no sense

If so just have Multiple AddressLists and teach users how to use them

- Rancy
Hendrik Wiese

Have a look at the following and see if it is of any help:
GAL Segmentation, Exchange Server 2010 and Address Book Policies

I guess I don't understand your response.  If we have say 2500 users in our Org and the other Org as 25,000 users, we don't want a single GAL with 27,500 users. If a user in our Org want to send to another user in our Org, why should they have to sift through all those entries.

Having said that, yes we just need two separate Address Lists. One for Our Org. Could be default GAL I guess. Not sure. The other list will be just the other Org.

My question is what is the best way to do this? I can certainly create a separate list for the other Org but then they would should up in both lists, won't they? Also, I am assuming the ABP is just for restricting certain users from accessing a particular policy, correct? Or, is there some way to use ABP in this senario?
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Manpreet SIngh Khatra

ABP ? just check the below articles once

Exchange 2003 / 2007 Address List Segregation Document - Updates!!

Exchange 2007 Address List Segregation Document Will be Out in February!!!

- Rancy

Well, that link talks about ABP but thats it. I don't think ABP will help here. It appears from what I read so far that you can use ABP to allow users to see only certain address lists. Not what we want to do here. We are just trying to break up a huge GAL into smaller lists. The question was, and still is, the easiest way (if there is one) to do this.

I can certainly create multiple address lists based on a Custom Attribute on the mailbox or Contact. Is that all there is to it? If so, then I just follow the process for ABP and segmentation and stop short of assigning policies. If that is what Rancy was saying in the first response, then I get it now.
Manpreet SIngh Khatra

Yes sir one more thing if you want like 2500 users to by default see their own address list and only GAL or others manually this can be done as well .... Value Add for you :)

- Rancy
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Well, not sure how we will approach this. We may leave the default GAL with all the 27000+ users and create two separate address list for each Org using Custom Attributes or Company Name as a filter. Another option is to hide all the Contacts from the other Org so they don't show up in the Default GAL but I don't know if setting the Hide from Address List on the Contact will prevent them from being added to another address list or be seen from Outlook if they were added. In other words, does the Hide from Address List hide them just from the Default GAL or all address lists?

We two separate Org lists in address to the huge Default GAL, I know users can control which address list they see when the compose an email. It defaults to the Default GAL but you can change that in Outlook to be whatever you want I think. Question is, can this be done on the backend with PowerShell so users don't have to or with a GPO?
Manpreet SIngh Khatra

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