Upgrade loses everything

I recently replaced Outlook 2003 with free Em Client when going to Windows10, and was delighted that the installation process copied my imap settings, current email folders , calendar entries, and contacts across to the Em client. This evening I was offered what looked like a simple release upgrade, which I accepted. But when it was done and the Em client reopened, it was empty - no folders, no imap connection, no calendar entries… Given how good it was at moving Outlook 2003 across I am shocked that a version upgrade seems to have removed everything.  Or did I do something wrong?