VeriSign Inc. is selling its Network Solutions business, which provides Internet domain name registrations, to Pivotal Private Equity for approximately $100 million so it can focus on infrastructure services. VeriSign gained Network Solutions' registrar and registry businesses when it purchased the company in 2000. The registrar business, which offers services such as business e-mail, Web sites, hosting and Web presence, will go to Pivotal Private Equity, the company said Thursday. VeriSign will retain the registry business, which provides the backbone for the .com and .net domain names. VeriSign recently renamed the registry business VeriSign Naming and Directory Services and...