I just ran the importer on my rather large database. It worked this time from localhost instead of over the network.
Items in red did not import, items in green were confirmed imported, items in orange cannot be confirmed because the do not apply.
Staff (including login passwords)
Client Groups Clients (excluding login passwords) Credit Card Payment Accounts Custom Client Fields and Values Client Notes Contacts - Imported as clients, this can be an issue... Tax Rules Currencies Invoices Recurring Invoices Transactions Client Credits Support Departments Support Tickets (excluding attachments) Support Predefined Response Categories Support Predefined Responses Sent Emails The following Settings:
Mail Delivery Type
SMTP Host, User, Password, Port, and Security Type Invoice Days Before Renewal Invoice Reminder Settings Auto Debit Days Before Due Suspend Services After Due
Calendar Events Products (become packages) Registrars (become modules/module rows) Servers (become modules/module rows) Services Domains (become services)