Can only generate default offline address book on 2007 MBX server, but not other OAB's.

I have four servers deployed in an Exchange 2007 Enterprise SP1 multi-role configuration organization. Two servers are CAS/HUB, and the other two are MBX servers in a CCR configuration. This environment is currently coexisting with a single Exchange 2003 Enterprise server, which was the first in the org a few years ago. I am trying to tansition completely to my 2007 enviornment, but the OAB generation process is kicking my tail. The entire enviornment is setup in a hosting architecture, but not useing any HMC or related software - everything is done manually. I have followed Microsoft Best Practices in all the areas of my deployment, but I am not finding much available regarding OAB generation.

I am able to generate the "Default Offline Address Book" no problem. But when I try to generate a customer OAB - "CompanyX OAL" I get an event ID 9301 error 9301: Failed to generate offline address book. 80072030. The default OAB, and CompanyX OAB's are all newly created on the 2007 enviornment. I have recreated them, restarted services, applied all current hotfixes, and updates. I have turned up OAB-related logging levels to EXPERT. I'd really appreciate some help with this as it is one of the last remaining issues in this transition.

Thanks much