We cannot change either the primary email address in the old account to the new one or add the new one (with our own domain) as a secondary because Zoho's system states "address already exists" (yes of course the other address exists). Is there a way to merge the older account into the new one? Having added a couple of hundred invoice items to the invoice module, we'd like to avoid having to add everything over again - even though this can be done by importing data (such imports are rarely if ever without flaws).