Address Book Problems after GW upgrade

I have just upgraded our GroupWise 5.2 system to GW 5.5.4 and we now have problems with users Personal Address Book entries. A bit of info first: our GW System Name is DMUS and our Internet Agent is called GWIA. If I look at the personal address book the entries start with GWIA:bob.smith@acme.com – this does not work and is returned as undeliverable. However, if I delete the entry and re-create it, it now reads DMUS.GWIA:bob.smith@acme.com and now works fine.

My question is: is there anyway of converting all users PAB entries automatically? Otherwise the users will have to do it themselves and this would be a nightmare!! Thanks in advance, Chris.