need to add x400 addresses in exchange 2007, replies to old emails are bouncing

We created a new domain with exchange 2007 server.
We exported user mailboxes from old SBS server into pst and imported into into exchange 2007 with exmerge.

Replies to old internal emails are bouncing because there is no x400 address.

How can I add these back in with Exchange 2007.  (Or a Windows XP computer with Exchange 2003 MGMT tools on it)

Thanks in advance.
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GMDtechAuthor Commented:
^^^  Tried that:  Got this:

  <?xml version="1.0" standalone="no" ?>
  <!DOCTYPE LogFile (View Source for full doctype...)>
- <XmlRoot xmlns="428201054929PM.xml">
  <user UserDN="LDAP://CN=User Name,OU=Users Cafe,DC=Domain,DC=local" type="Failure" attribute="proxyaddress,multivalued" message="ADMODIFY.ERR - The specified directory service attribute or value does not exist. (Exception from HRESULT: 0x8007200A)" />
GMDtechAuthor Commented:
ok..  the admodify did work..
i typed "proxyaddress" instead of "proxyaddresses" minor difference was the difference between working and not working.

also for future reference to anyone who may stumble upon this:

to manually add an "x400" address into exchange 2007.

go to the email address tab for the user
click the small drop down arrow next to "new" address button and select "custom"
enter the address in the following format: /O=UserDomain/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=MailboxAliasName
type "x500" into the "E-mail Type:" box and you should be good to go.
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