Unfortunately import/export was something that was never put in the main branch of PHPGW. There were lots of patches over the years, but nothing made it into the main code. Mostly due to the developers stopping work years ago, but also because most of the patches were flawed from what I read.
I'll hve to see what format can be used, I can probably get the whole database into MS Access and then manipulate it via queries so as to then export to csv for Zimbra to import.
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