Deflexion.com

Cyrus Daboo of Cyrusoft/Mulberry fame posted this
message in the Mulberry discussion group. Here's an excerpt

The problem has been that there is no widely adopted standard for doing
this. ACAP was supposed to be a standard solution but was too complex so
did not get any vendor buy-in. XCAP is supposed to address just the
preferences part of the original ACAP design - and it does look promising
as a solution which vendors will buy in to. It does not directly solve the
address book portion - in theory it could, but I think a WebDAV solution
might be more appropriate (where the fundamental data type is vCard rather
than XML as vCard is widely supported by address book apps right now).

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