2017, Plaxo notified its users that it would be shutting down the Plaxo service at the end of the day on December 31, 2017. Functionality Plaxo provided automatic updating of contact information. Users and their contacts stored their information in the cloud on Plaxo's servers. When this information was edited by the user, the changes appeared in the address books of all those who listed the account changer in their own books. Once contacts were stored in the central location, it was possible to list connections between contacts and access the address book from anywhere. A Plaxo plug-in supported major address books including Outlook/Outlook Express, Mozilla Thunderbird, and macOS's Contacts, iOS and BlackBerry, and others could be supported through an application programming interface. Additionally, Plaxo could be maintained online. Plaxo 3.0 On June 24, 2007 Plaxo announced the public beta of a major new version of its service, called Plaxo 3.0. The service emphasizes "automated, multi-way sync." Charging for Outlook synchronization service On July 30, 2009, the previously-free synchronization services for Outlook moved to Plaxo's premium (paid) service. According to Plaxo, "this change will allow us to continue to invest in the development and support of this valuable (but high-cost) feature." Existing users of the free service were offered a 20% lifetime discount on Plaxo premium. This paid service was called Platinum Sync. Personal Assistant On March 16, 2011, Plaxo announced its Personal Assistant which updates users' address books with suggestions from publicly available information. Mobile applications On July 19, 2011, Plaxo announced an improved iPhone app; a new BlackBerry app; a Windows Mobile app; and syncing for Android phones with an app coming out by the end of September. References American social networking websites Personal information manager software for Windows Personal information manager software for macOS Professional networks Companies based in Sunnyvale, California Internet services supporting OpenID