ACTIVE DIRECTORY, EXCHANGE

I have AD sites each are having their own exchange server and domain controller. All AD sites are having exchange  resource forest and all users in exchange  are linked to their account forest which are having DC.

 in these AD sites some domains are having external and some domains are having forest relationship between them.

 ones which are having external relationship between domains i see  AD extended attributes (1-15) for users under attribute editor TAB

 but i dont see extension attributes for users for domains which are having forest relationship.

 i see no filters on attribute editor , replication works between domains which are having forest relationship.

I found from my last experts , that attributes can be added manually.

Extending schema is the next option for exchange. Check with your client and management, if they really want to extend it. As you are in resource concept, I don't see reason you want to extend.

in ADSIEDIT.MSC

MY OWN DOMAIN, if I go to display specifiers -409 properties -extension name is not set , where as all users are having extension attributes in their user properties

 on the other hand if I go to other domain where I have forest relationship,  I am missing extension attributes of users and when I go to display specifiers-409 properties in same way I see extension name with some phone numbers and all.(ATTACHING IMAGE)

so how can I add extension attribute 1 to 15 in this domain or add new custom attribute with just email address, phone number

Extending schema is the next option for exchange. how should I do in resource forest set up I have

exchange is in resource forest and DC is in account forest , users are linked users
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