Using Windows 7, Outlook 2013, and Apple's iCloud, after installing an update of iCloud, all Outlook contacts disappeared. Apple does not know why, although they are researching the matter. The Address Book window in Outlook is completely blank, although there is a possibility that the contacts may still be in outlook, since autocomplete fills in the names of partially completed email addresses when a new email is created. We have lost over 1,400 personal, business and professional contacts, phone numbers, email addresses and web locations from the address book. Any assistance greatly appreciated.