This article describes how to deploy signatures in a domain forest, where you need to point specifically to a part of the domain.

In special cases you need to point Sign.exe to look specifically into e.g. us.company.com and the UK users into uk.company.com. 


Create two HKCU registry files with this content:  


Code:

Windows Registry Editor Version 5.00     

[HKEY_CURRENT_USER\Software\Office add-on\eMailSignature] 
"root"="LDAP://dc=us.dc=company,dc=com" 

   

and  


Code:

Windows Registry Editor Version 5.00   

[HKEY_CURRENT_USER\Software\Office add-on\eMailSignature] 
"root"="LDAP://dc=uk.dc=company,dc=com"

  

Name them uk.reg and us.reg, respectively.  


Before running Sign.exe for US users, run the us.reg file before sign.exe. This will write the root key into registry and hence redirect Sign.exe to the specific portion of the AD. 

Do the similar thing with UK by running uk.reg before Sign.exe for UK users.


When users run Sign.exe they will now pick up the correct information and generate signatures as desired.