The only way to synchronize your contacts with the Sanyo 8100 phone book is to use a Software called SnapSync™ from FutureDial.
You need the USB cable to connect the phone to the PC or Notebook. With FutureDial's SnapSync™ Software, you can save and share phonebook data and MS Outlook™ contact information between your PC and mobile phones.
Works with Windows 98 (2nd edition), Me, 2000 or XP Operating System and MS Outlook 98, 2000 or 2002.
You can buy the SnapSync Software at Radioshack.com
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