Presumably you are referring to city guides as none of regular mapping data is identifiable in 16 folders 0 - 9 and a - f?
You won't free up much space deleting empty folders. I have never tried doing this myself for that reason. I don't see why you will have any problems except for when you want want to download the map data for the countries you have removed the folder for. Even then, it is nothing that can't be resolved by deleting the Cities folder and running Ovi Maps to recreate the folder structure. I'll be interested to see how you get on.
If you delete the Cities folder, running Ovi Maps the next time will recreate the directory structure. What you are trying to do may be for nothing if the next time you run Ovi Maps, the missing folders are recreated. Be interesting to see if it does happen.
Thank you for answering so promptly. I'm talking about folders in e:/cities/diskcache/clientindex. They seem to be named with shortened country names. Plus I deleted all the maps with the ovi suit and downloaded only France and UK. I was trying to free some memory on the card. Have I done anything wrong?
You are referring to standard UN 3 letter country abbreviation in ClientIndex, remember however if you delete them and re-install just one European country the ClientIndex for Europe is automatically downloaded again.
Setting it to online just means that map data and search data is download as required. Setting Ovi Maps to online does not speed up position fix but enabling Agps and Network based in Positioning Methods does.
If I'm not wrong, the Clientindex folder includes the index files, which allow OVI Maps to search for addresses offline. If you're always online, then no problem..