Auto setting everyone's email signature


We are on a domain using Exchange Server 2007.  we have multiple companies that are all on the same exchange server.  I want to set it to where only users at this branch all have the same email signature.  

I was trying to follow the instructions from here:

But they change it for the entire Mailbox group on the Exchange server, which would change it for all users even those who aren't at this branch.  So I want it to just change for the users with and that's all.  Any ideas on how to accomplish this?
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Hypercat (Deb)Connect With a Mentor Commented:
If your branch is not too large, when you create the Transport rule, you could check on the Conditions page "from people" and then select the specific users in your branch from the list of mailboxes in the entire organization.  Even easier would be to create a distribution list (maybe you already have one) of the users in your branch, and then use the "from a member of distribution list."
TymetwisterAuthor Commented:
Well we do have a large amount of users- about 150- and we are constantly hiring and dropping people, so it would need to be something that is consistent, not something that would always have to be updated with each new hire/term.
Hypercat (Deb)Commented:
Would a dynamic distribution list work?  The users would have to have an AD attribute, like department or a custom attribute, set on their accounts that you can use to designate them as users who should be added to the distribution list. However, if it's something you're already doing when you add users, that could alleviate the need to add them specifically to the distribution list.
TymetwisterAuthor Commented:
On the Organization tab in AD, each of the users we want all have the same "Company" filled in that field.  Is there something I can work with that so that it only affects those users?
Mahesh SharmaCommented:
Check this vbscript,
May be usefull adding it to GPO when user login provided different branch users are in different OU's
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