I mounted an empty CardDAV/CalDAV server to my eMClient to synchronize my 5000+ contacts to a server and distribute it to mobile and other applications. Many of the contacts synched over, but then I got an “internal error” and synch stopped working. I thought it meant the server had an internal error, so I changed my authentication and URL mountpoint. However, this move caused eMClient to acquire the zero contacts from the new empty server, and dump all the contacts it was holding, instead of the other way around. I attempted to recover contacts from the previous CardDAV/CalDAV mountpoint, to no avail.
I found the previous subdirectory with the contact_data files in the emMail data directories, and the file sizes indicate that they probably contain all the previous contacts. I stopped eMClient and copied these into the latest subdirectory, and restarted eMClient, but nothing happened. It appears eMClient did copy the latest subdirectory and all its files into a new subdirectory, but didn’t attempt to load those contacts.
What can I do to recover those contacts into eMClient?