We have an exchange 2007 user who have all blank entries in the GAL when viewing his name on the contact info in the GAL. When you view this same user in OWA the properties are populated. Now we are using the outlook client 2010 in online mode which replicates with active directory and not dependent on a OAB file.
At a quick glance We looked in ADSIEDIT and it appears that all the properties are similar to a user who is not having this issue. One other major thing. When you search for the user it shows info on the title, phone number, and so forth when searching. The blank issue shows up when you double click on the name and or review the properties.