The Application Configuration Access Protocol (ACAP) is a protocol for storing and synchronizing general configuration and preference data. It was originally developed so that IMAP clients can easily access address books, user options, and other data on a central server and be kept in synch across all clients. Two International ACAP Conferences were held, one in Pittsburgh, PA, USA, in 1997, and the other at Qualcomm Incorporated, San Diego, CA, USA, in February 1998.