<s>
vCard	O
Extensions	O
to	O
WebDAV	B-Protocol
(	O
CardDAV	B-Protocol
)	O
is	O
an	O
address	B-Operating_System
book	I-Operating_System
client/server	O
protocol	O
designed	O
to	O
allow	O
users	O
to	O
access	O
and	O
share	O
contact	O
data	O
on	O
a	O
server	O
.	O
</s>
<s>
The	O
CardDAV	B-Protocol
protocol	O
was	O
developed	O
by	O
the	O
IETF	O
and	O
was	O
published	O
as	O
in	O
August	O
2011	O
.	O
</s>
<s>
CardDAV	B-Protocol
is	O
based	O
on	O
WebDAV	B-Protocol
,	O
which	O
is	O
based	O
on	O
HTTP	B-Protocol
,	O
and	O
it	O
uses	O
vCard	O
for	O
contact	O
data	O
.	O
</s>
<s>
CardDAV	B-Protocol
was	O
proposed	O
as	O
an	O
open	O
standard	O
for	O
contact	O
management	O
in	O
August	O
2011	O
.	O
</s>
<s>
It	O
became	O
known	O
as	O
a	O
synchronization	O
protocol	O
in	O
iOS	B-Operating_System
7	O
,	O
among	O
other	O
things	O
,	O
and	O
is	O
now	O
also	O
supported	O
by	O
Gmail	B-Application
,	O
where	O
it	O
replaces	O
the	O
no	O
longer	O
supported	O
(	O
by	O
Google	B-Application
)	O
ActiveSync	O
standard	O
.	O
</s>
<s>
The	O
following	O
products	O
implement	O
the	O
server-side	O
portion	O
of	O
the	O
CardDAV	B-Protocol
protocol	O
:	O
</s>
<s>
Apple	O
Contacts	B-Application
Server	I-Application
.	O
</s>
<s>
Baïkal	O
it	O
is	O
a	O
lightweight	O
CalDAV	B-Protocol
and	O
CardDAV	B-Protocol
server	O
.	O
</s>
<s>
CommuniGate	B-Protocol
Pro	I-Protocol
supports	O
CardDav	B-Protocol
protocol	O
.	O
</s>
<s>
GMail	B-Application
and	O
Google	B-Application
Contacts	B-Operating_System
allow	O
access	O
to	O
user	O
's	O
address	B-Operating_System
book	I-Operating_System
via	O
CardDAV	B-Protocol
.	O
</s>
<s>
Horde	B-Language
Groupware	I-Language
,	O
a	O
complete	O
web-based	O
groupware	O
solution	O
with	O
CalDAV	B-Protocol
and	O
CardDAV	B-Protocol
support	O
.	O
</s>
<s>
Nextcloud	B-General_Concept
supports	O
CardDAV	B-Protocol
protocol	O
since	O
the	O
first	O
version	O
.	O
</s>
<s>
ownCloud	B-Language
supports	O
CardDAV	B-Protocol
protocol	O
since	O
version	O
2.0	O
.	O
</s>
<s>
SabreDAV	B-Application
,	O
a	O
WebDAV	B-Protocol
framework	O
for	O
PHP	O
,	O
supports	O
CardDAV	B-Protocol
since	O
version	O
1.5	O
.	O
</s>
<s>
SOGo	B-Language
supports	O
CardDAV	B-Protocol
access	O
to	O
its	O
address	B-Operating_System
books	I-Operating_System
.	O
</s>
<s>
Zimbra	B-Protocol
6	O
allows	O
access	O
to	O
its	O
address	B-Operating_System
book	I-Operating_System
via	O
CardDAV	B-Protocol
.	O
</s>
<s>
SYNOLOGY	B-Operating_System
DSM	O
6.0	O
supports	O
CardDAV	B-Protocol
.	O
</s>
<s>
Xandikos	O
is	O
a	O
lightweight	O
CalDAV/CardDAV	O
server	O
.	O
</s>
<s>
The	O
following	O
products	O
implement	O
the	O
client-side	O
portion	O
of	O
the	O
CardDAV	B-Protocol
protocol	O
:	O
</s>
<s>
Apple	O
Contacts	B-Operating_System
starting	O
from	O
Mac	B-Device
OS	I-Device
X	I-Device
Snow	I-Device
Leopard	I-Device
and	O
higher	O
.	O
</s>
<s>
Apple	B-Operating_System
iOS	I-Operating_System
,	O
starting	O
from	O
iOS	B-Operating_System
4	O
.	O
</s>
<s>
Evolution	B-Language
has	O
built-in	O
support	O
for	O
CalDAV/CardDAV	O
.	O
</s>
<s>
KDE	B-Application
Software	O
Compilation	O
4.5	O
will	O
feature	O
CardDAV	B-Protocol
client	O
support	O
,	O
due	O
in	O
August	O
2010	O
.	O
</s>
<s>
It	O
will	O
be	O
available	O
for	O
use	O
by	O
Kaddressbook	O
,	O
which	O
is	O
part	O
of	O
Kontact	B-Language
PIM	B-Application
suite	O
.	O
</s>
<s>
It	O
will	O
be	O
provided	O
by	O
Akonadi	B-Language
:	O
a	O
PIM	B-Application
server	O
which	O
will	O
also	O
make	O
the	O
data	O
available	O
to	O
other	O
applications	O
.	O
</s>
<s>
Thunderbird	B-Application
,	O
native	O
from	O
version	O
91	O
,	O
or	O
the	O
CardBook	O
add-on	O
.	O
</s>
