The Mayo Clinic has combined its medical expertise with Microsoft’s technology in a free Web site launching Tuesday that will let people store personal health and medical information. The “Mayo Clinic Health Manager,” as the site is called, is one of many emerging services for so-called personal health records. The sites, from companies such as Microsoft and Google and major health insurers, are meant to give people an easy way to stash medical information and transfer it to a new clinic, hospital or specialist.