<s>
Mac	B-Application
OS	I-Application
X	O
Server	O
is	O
a	O
discontinued	O
series	O
of	O
Unix-like	B-Operating_System
server	O
operating	B-General_Concept
systems	I-General_Concept
developed	O
by	O
Apple	O
Inc	O
.	O
based	O
on	O
macOS	B-Application
.	O
</s>
<s>
It	O
provided	O
server	O
functionality	O
and	O
system	O
administration	O
tools	O
,	O
and	O
tools	O
to	O
manage	O
both	O
macOS-based	O
computers	O
and	O
iOS-based	O
devices	O
,	O
network	B-General_Concept
services	I-General_Concept
such	O
as	O
a	O
mail	B-Protocol
transfer	I-Protocol
agent	I-Protocol
,	O
AFP	B-Protocol
and	O
SMB	B-Operating_System
servers	O
,	O
an	O
LDAP	B-Protocol
server	O
,	O
and	O
a	O
domain	B-Protocol
name	I-Protocol
server	I-Protocol
,	O
as	O
well	O
as	O
server	B-Application
applications	I-Application
including	O
a	O
Web	B-Application
server	I-Application
,	O
database	O
,	O
and	O
calendar	B-Application
server	I-Application
.	O
</s>
<s>
Starting	O
with	O
OS	B-Application
X	I-Application
Lion	I-Application
,	O
Apple	O
stopped	O
selling	O
a	O
standalone	O
server	O
operating	B-General_Concept
system	I-General_Concept
,	O
instead	O
releasing	O
an	O
add-on	O
Server	O
app	O
marketed	O
as	O
OS	O
X	O
Server	O
(	O
and	O
later	O
macOS	B-Application
Server	O
)	O
,	O
which	O
was	O
sold	O
through	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
.	O
</s>
<s>
The	O
Server	O
app	O
lacked	O
many	O
features	O
from	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
,	O
and	O
later	O
versions	O
of	O
the	O
app	O
only	O
included	O
functionality	O
related	O
to	O
user	O
and	O
group	O
management	O
,	O
Xsan	B-Application
,	O
and	O
mobile	O
device	O
management	O
through	O
profiles	O
.	O
</s>
<s>
The	O
Server	O
app	O
was	O
discontinued	O
on	O
April	O
21	O
,	O
2022	O
,	O
and	O
Apple	O
said	O
that	O
later	O
versions	B-Operating_System
of	I-Operating_System
macOS	I-Operating_System
would	O
drop	O
support	O
for	O
it	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
is	O
based	O
on	O
an	O
open	B-License
source	I-License
foundation	O
called	O
Darwin	B-Operating_System
and	O
uses	O
open	O
industry	O
standards	O
and	O
protocols	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
was	O
provided	O
as	O
the	O
operating	B-General_Concept
system	I-General_Concept
for	O
Xserve	B-Device
computers	O
,	O
rack	O
mounted	O
server	B-Application
computers	I-Application
designed	O
by	O
Apple	O
.	O
</s>
<s>
Also	O
,	O
it	O
was	O
optionally	O
pre-installed	B-Application
on	O
the	O
Mac	B-Device
Mini	I-Device
and	O
Mac	B-Device
Pro	I-Device
and	O
was	O
sold	O
separately	O
for	O
use	O
on	O
any	O
Macintosh	B-Device
computer	O
meeting	O
its	O
minimum	O
requirements	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
1.0	O
was	O
released	O
in	O
March	O
1999	O
,	O
predating	O
the	O
release	O
of	O
the	O
consumer	O
version	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
by	O
two	O
years	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
1.0	O
was	O
based	O
on	O
Rhapsody	B-Operating_System
,	O
a	O
hybrid	B-Operating_System
of	O
OPENSTEP	B-Operating_System
from	O
NeXT	O
Computer	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
8.5.1	I-Operating_System
.	O
</s>
<s>
The	O
GUI	B-Application
looked	O
like	O
a	O
mixture	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
's	O
Platinum	O
appearance	O
with	O
OPENSTEP	B-Operating_System
's	O
NeXT-based	O
interface	O
.	O
</s>
<s>
There	O
was	O
discussion	O
of	O
implementing	O
a	O
'	O
transparent	O
blue	O
box	O
 '	O
which	O
would	O
intermix	O
Mac	B-Application
OS	I-Application
applications	O
with	O
those	O
written	O
for	O
Rhapsody	B-Operating_System
's	O
Yellow	O
Box	O
environment	O
,	O
but	O
this	O
would	O
not	O
happen	O
until	O
Mac	B-Application
OS	I-Application
X	I-Application
's	O
Classic	O
environment	O
.	O
</s>
<s>
Apple	O
File	O
Services	O
,	O
Macintosh	B-Device
Manager	O
,	O
QuickTime	B-Operating_System
Streaming	I-Operating_System
Server	I-Operating_System
,	O
WebObjects	B-Language
,	O
and	O
NetBoot	B-Device
were	O
included	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
1.0	O
.	O
</s>
<s>
It	O
could	O
not	O
use	O
FireWire	B-Protocol
devices	O
.	O
</s>
<s>
The	O
last	O
release	O
is	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
1.2v3	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.0	O
(	O
released	O
May	O
21	O
,	O
2001	O
)	O
included	O
the	O
new	O
Aqua	B-Application
user	I-Application
interface	I-Application
,	O
Apache	B-Application
,	O
PHP	B-Application
,	O
MySQL	B-Application
,	O
Tomcat	B-Language
,	O
WebDAV	B-Protocol
support	O
,	O
Macintosh	B-Device
Manager	O
,	O
and	O
NetBoot	B-Device
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.1	O
(	O
released	O
September	O
25	O
,	O
2001	O
)	O
featured	O
improved	O
performance	O
,	O
increased	O
system	O
stability	O
,	O
and	O
decreased	O
file	O
transfer	O
times	O
compared	O
to	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.0	O
.	O
</s>
<s>
Support	O
was	O
added	O
for	O
RAID	B-Architecture
0	O
and	O
RAID	B-Architecture
1	O
storage	O
configurations	O
,	O
and	O
Mac	B-Application
OS	I-Application
9.2.1	O
in	O
NetBoot	B-Device
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.2	O
(	O
released	O
August	O
23	O
,	O
2002	O
)	O
includes	O
updated	O
Open	B-Operating_System
Directory	I-Operating_System
user	O
and	O
file	O
management	O
,	O
which	O
with	O
this	O
release	O
is	O
based	O
on	O
LDAP	B-Protocol
,	O
beginning	O
the	O
deprecation	O
of	O
the	O
NeXT-originated	O
NetInfo	O
architecture	O
.	O
</s>
<s>
The	O
new	O
Workgroup	B-Operating_System
Manager	I-Operating_System
interface	O
improved	O
configuration	O
significantly	O
.	O
</s>
<s>
The	O
release	O
also	O
saw	O
major	O
updates	O
to	O
NetBoot	B-Device
and	O
NetInstall	O
.	O
</s>
<s>
Many	O
common	O
network	B-General_Concept
services	I-General_Concept
are	O
provided	O
such	O
as	O
NTP	B-Protocol
,	O
SNMP	B-Protocol
,	O
web	B-Application
server	I-Application
(	O
Apache	B-Application
)	O
,	O
mail	B-Protocol
server	I-Protocol
(	O
Postfix	B-Application
and	O
Cyrus	B-Protocol
)	O
,	O
LDAP	B-Protocol
(	O
OpenLDAP	B-Language
)	O
,	O
AFP	B-Protocol
,	O
and	O
print	O
server	O
.	O
</s>
<s>
The	O
inclusion	O
of	O
Samba	B-Language
version	O
3	O
allows	O
tight	O
integration	O
with	O
Windows	B-Application
clients	O
and	O
servers	O
.	O
</s>
<s>
MySQL	B-Application
v4.0.16	O
and	O
PHP	B-Application
v4.3.7	O
are	O
also	O
included	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.3	O
(	O
released	O
October	O
24	O
,	O
2003	O
)	O
release	O
includes	O
updated	O
Open	B-Operating_System
Directory	I-Operating_System
user	O
and	O
file	O
management	O
,	O
which	O
with	O
this	O
release	O
is	O
based	O
on	O
LDAP	B-Protocol
,	O
beginning	O
the	O
deprecation	O
of	O
the	O
NeXT-originated	O
NetInfo	O
architecture	O
.	O
</s>
<s>
The	O
new	O
Workgroup	B-Operating_System
Manager	I-Operating_System
interface	O
improved	O
configuration	O
significantly	O
.	O
</s>
<s>
Many	O
common	O
network	B-General_Concept
services	I-General_Concept
are	O
provided	O
such	O
as	O
NTP	B-Protocol
,	O
SNMP	B-Protocol
,	O
web	B-Application
server	I-Application
(	O
Apache	B-Application
)	O
,	O
mail	B-Protocol
server	I-Protocol
(	O
Postfix	B-Application
and	O
Cyrus	B-Protocol
)	O
,	O
LDAP	B-Protocol
(	O
OpenLDAP	B-Language
)	O
,	O
AFP	B-Protocol
,	O
and	O
print	O
server	O
.	O
</s>
<s>
The	O
inclusion	O
of	O
Samba	B-Language
version	O
3	O
allows	O
tight	O
integration	O
with	O
Windows	B-Application
clients	O
and	O
servers	O
.	O
</s>
<s>
MySQL	B-Application
v4.0.16	O
and	O
PHP	B-Application
v4.3.7	O
are	O
also	O
included	O
.	O
</s>
<s>
The	O
10.4	O
release	O
(	O
April	O
29	O
,	O
2005	O
)	O
adds	O
64-bit	B-Device
application	O
support	O
,	O
Access	O
Control	O
Lists	O
,	O
Xgrid	B-Operating_System
,	O
link	B-Architecture
aggregation	I-Architecture
,	O
e-mail	O
spam	O
filtering	O
(	O
SpamAssassin	B-Language
)	O
,	O
virus	O
detection	O
(	O
ClamAV	B-Application
)	O
,	O
Gateway	O
Setup	O
Assistant	O
,	O
and	O
servers	O
for	O
Software	O
Update	O
,	O
iChat	B-Application
Server	I-Application
using	O
XMPP	B-Protocol
,	O
Boot	O
Camp	O
Assistant	O
,	O
Dashboard	O
,	O
and	O
Weblog	O
Server	O
based	O
on	O
the	O
open-source	B-License
Blojsom	O
project	O
(	O
Java	B-Language
)	O
.	O
</s>
<s>
On	O
August	O
10	O
,	O
2006	O
,	O
Apple	O
announced	O
the	O
first	O
Universal	B-Operating_System
Binary	I-Operating_System
release	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
,	O
version	O
10.4.7	O
,	O
supporting	O
both	O
PowerPC	B-Architecture
and	O
Intel	O
processors	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
Apple	O
announced	O
the	O
release	O
of	O
the	O
Intel-based	O
Mac	B-Device
Pro	I-Device
and	O
Xserve	B-Device
systems	O
.	O
</s>
<s>
Mac	O
OSX	O
Server	O
version	O
10.5.x	O
‘	O
Leopard’	O
was	O
the	O
last	O
major	O
version	O
of	O
Mac	O
OSX	O
Server	O
to	O
support	O
PowerPC-based	O
servers	O
and	O
workstations	O
such	O
as	O
the	O
Apple	O
Xserve	B-Device
G5	B-Device
and	O
Power	B-Device
Mac	I-Device
G5	I-Device
.	O
</s>
<s>
RADIUS	B-Protocol
Server	I-Protocol
.	O
</s>
<s>
Ruby	B-Application
on	I-Application
Rails	I-Application
.	O
</s>
<s>
Mac	O
OSX	O
Server	O
version	O
10.5	O
‘	O
Leopard’	O
was	O
the	O
first	O
version	O
to	O
ship	O
with	O
Ruby	B-Application
on	I-Application
Rails	I-Application
,	O
the	O
server-side	B-Application
Web	B-Application
application	I-Application
framework	I-Application
used	O
by	O
sites	O
such	O
as	O
GitHub	B-Application
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Snow	O
Leopard	O
Server	O
(	O
released	O
August	O
28	O
,	O
2009	O
)	O
sold	O
for	O
$499	O
and	O
included	O
unlimited	O
client	O
licenses	O
.	O
</s>
<s>
Full	O
64-bit	B-Device
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
On	O
appropriate	O
systems	O
with	O
4GB	O
of	O
RAM	O
or	O
more	O
,	O
Snow	O
Leopard	O
Server	O
uses	O
a	O
64-bit	B-Device
kernel	O
to	O
address	O
up	O
to	O
a	O
theoretical	O
16TB	O
of	O
RAM	O
.	O
</s>
<s>
iCal	B-Application
Server	I-Application
2	O
with	O
improved	O
CalDAV	B-Protocol
support	O
,	O
a	O
new	O
web	O
calendaring	O
application	O
,	O
push	O
notifications	O
and	O
the	O
ability	O
to	O
send	O
email	O
invitations	O
to	O
non-iCal	O
users	O
.	O
</s>
<s>
Address	B-Application
Book	I-Application
Server	I-Application
provides	O
a	O
central	O
location	O
for	O
users	O
to	O
store	O
and	O
access	O
personal	O
contacts	O
across	O
multiple	O
Macs	O
and	O
synchronized	O
iPhones	O
.	O
</s>
<s>
Based	O
on	O
the	O
CardDAV	B-Protocol
protocol	O
standard	O
.	O
</s>
<s>
Wiki	B-Operating_System
Server	I-Operating_System
2	O
,	O
with	O
server	B-Application
side	I-Application
Quick	B-Operating_System
Look	I-Operating_System
and	O
the	O
ability	O
to	O
view	O
wiki	O
content	O
on	O
iPhone	O
.	O
</s>
<s>
A	O
new	O
Mail	B-Protocol
server	I-Protocol
engine	O
that	O
supports	O
push	O
email	O
so	O
users	O
receive	O
immediate	O
access	O
to	O
new	O
messages	O
.	O
</s>
<s>
Podcast	O
Composer	O
creates	O
a	O
workflow	O
to	O
add	O
titles	O
,	O
transitions	O
and	O
effects	O
,	O
save	O
to	O
a	O
desired	O
format	O
and	O
share	O
to	O
wikis	O
,	O
blogs	O
,	O
iTunes	B-Operating_System
,	O
iTunes	B-Operating_System
U	O
,	O
Final	B-Application
Cut	I-Application
Server	I-Application
or	O
Podcast	O
Library	O
.	O
</s>
<s>
Mobile	O
Access	O
Server	O
enables	O
iPhone	O
and	O
Mac	O
users	O
to	O
access	O
secured	O
network	B-General_Concept
services	I-General_Concept
,	O
including	O
corporate	O
websites	O
,	O
online	O
business	O
applications	O
,	O
email	O
,	O
calendars	B-Operating_System
and	O
contacts	O
.	O
</s>
<s>
Without	O
requiring	O
additional	O
software	O
,	O
Mobile	O
Access	O
Server	O
acts	O
as	O
a	O
reverse	O
proxy	O
server	O
and	O
provides	O
SSL	B-Protocol
encryption	I-Protocol
and	O
authentication	O
between	O
the	O
user	O
's	O
iPhone	O
or	O
Mac	O
and	O
a	O
private	O
network	O
.	O
</s>
<s>
In	O
releasing	O
the	O
developer	O
preview	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
in	O
February	O
2011	O
,	O
Apple	O
indicated	O
that	O
beginning	O
with	O
Lion	B-Application
,	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
would	O
be	O
bundled	O
with	O
the	O
operating	B-General_Concept
system	I-General_Concept
and	O
would	O
not	O
be	O
marketed	O
as	O
a	O
separate	O
product	O
.	O
</s>
<s>
However	O
,	O
a	O
few	O
months	O
later	O
,	O
the	O
company	O
said	O
it	O
would	O
instead	O
sell	O
the	O
server	O
components	O
as	O
a	O
US	O
$49.99	O
add-on	O
to	O
Lion	B-Application
,	O
distributed	O
through	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
(	O
as	O
well	O
as	O
Lion	B-Application
itself	O
)	O
.	O
</s>
<s>
The	O
combined	O
cost	O
of	O
an	O
upgrade	O
to	O
Lion	B-Application
and	O
the	O
purchase	O
of	O
the	O
OS	O
X	O
Server	O
add-on	O
,	O
which	O
costs	O
approximately	O
US$50	O
,	O
was	O
nonetheless	O
significantly	O
lower	O
than	O
the	O
retail	O
cost	O
of	O
Snow	O
Leopard	O
Server	O
(	O
US$499	O
)	O
.	O
</s>
<s>
Lion	B-Application
Server	O
came	O
with	O
unlimited	O
client	O
licenses	O
as	O
did	O
Snow	O
Leopard	O
Server	O
.	O
</s>
<s>
Lion	B-Application
Server	O
includes	O
new	O
versions	O
of	O
iCal	B-Application
Server	I-Application
,	O
Wiki	B-Operating_System
Server	I-Operating_System
,	O
and	O
Mail	B-Protocol
Server	I-Protocol
.	O
</s>
<s>
More	O
significantly	O
,	O
Lion	B-Application
Server	O
can	O
be	O
used	O
for	O
iOS	B-Application
mobile	O
device	O
management	O
.	O
</s>
<s>
Starting	O
with	O
Apple	O
Mac	O
OSX	O
Server	O
Version	O
10.7	B-Application
“	O
Lion	B-Application
,	O
”	O
PostgreSQL	B-Application
replaces	O
MySQL	B-Application
as	O
the	O
database	O
provided	O
with	O
Mac	O
OSX	O
Server	O
,	O
coinciding	O
with	O
Oracle	B-Application
Corporation	I-Application
’s	O
acquisition	O
of	O
Sun	O
Microsystems	O
and	O
Oracle	B-Application
’s	O
subsequent	O
attempts	O
to	O
tighten	O
MySQL	B-Application
’s	O
licensing	O
restrictions	O
and	O
to	O
exert	O
influence	O
on	O
MySQL	B-Application
’s	O
previously	O
open	O
and	O
independent	O
development	O
model	O
.	O
</s>
<s>
Like	O
Lion	B-Application
,	O
Mountain	O
Lion	B-Application
had	O
no	O
separate	O
server	O
edition	O
.	O
</s>
<s>
An	O
OS	O
X	O
Server	O
package	O
was	O
available	O
for	O
Mountain	O
Lion	B-Application
from	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
for	O
US	O
$19.99	O
,	O
which	O
included	O
a	O
server	O
management	O
application	O
called	O
Server	O
,	O
as	O
well	O
as	O
other	O
additional	O
administrative	O
tools	O
to	O
manage	O
client	O
profiles	O
and	O
Xsan	B-Application
.	O
</s>
<s>
Mountain	O
Lion	B-Application
Server	O
,	O
like	O
Lion	B-Application
Server	O
,	O
was	O
provided	O
with	O
unlimited	O
client	O
licenses	O
,	O
and	O
once	O
purchased	O
could	O
be	O
run	O
on	O
an	O
unlimited	O
number	O
of	O
systems	O
.	O
</s>
<s>
Server	O
5.7	O
(	O
released	O
September	O
28	O
,	O
2018	O
)	O
stopped	O
bundling	O
open	B-License
source	I-License
services	O
such	O
as	O
Calendar	B-Application
Server	I-Application
,	O
Contacts	O
Server	O
,	O
the	O
Mail	B-Protocol
Server	I-Protocol
,	O
DNS	B-Protocol
,	O
DHCP	B-Protocol
,	O
VPN	B-Application
Server	I-Application
,	O
and	O
Websites	O
.	O
</s>
<s>
Included	O
services	O
are	O
now	O
limited	O
to	O
Profile	O
Manager	O
,	O
Open	B-Operating_System
Directory	I-Operating_System
and	O
Xsan	B-Application
.	O
</s>
<s>
The	O
Server	O
app	O
does	O
not	O
support	O
versions	B-Operating_System
of	I-Operating_System
macOS	I-Operating_System
newer	O
than	O
Monterey	O
,	O
marking	O
the	O
end	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
product	O
line	O
.	O
</s>
<s>
One	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
's	O
main	O
administrative	O
tools	O
was	O
the	O
Server	O
Administrator	O
app	O
,	O
which	O
allowed	O
users	O
to	O
configure	O
server	O
services	O
,	O
and	O
turn	O
them	O
on	O
or	O
off	O
.	O
</s>
<s>
RAID	B-Application
Admin	I-Application
was	O
a	O
utility	O
for	O
administering	O
and	O
controlling	O
RAIDs	B-Architecture
,	O
usually	O
Xserve	B-Application
RAIDs	I-Application
.	O
</s>
<s>
It	O
was	O
written	O
in	O
Java	B-Language
,	O
and	O
could	O
run	O
on	O
Windows	B-Application
or	O
Linux	B-Application
.	O
</s>
<s>
Beginning	O
with	O
the	O
release	O
of	O
OS	B-Operating_System
X	I-Operating_System
Mountain	I-Operating_System
Lion	I-Operating_System
(	O
version	O
10.8	B-Operating_System
)	O
,	O
there	O
is	O
only	O
one	O
Administrative	O
tool	O
,	O
an	O
app	O
called	O
"	O
Server	O
"	O
,	O
which	O
can	O
be	O
bought	O
and	O
downloaded	O
from	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
,	O
and	O
is	O
updated	O
independently	O
of	O
OS	O
X	O
.	O
</s>
<s>
This	O
Server	O
tool	O
is	O
used	O
to	O
configure	O
,	O
maintain	O
and	O
monitor	O
one	O
or	O
more	O
macOS	B-Application
Server	O
installations	O
.	O
</s>
<s>
Apple	O
's	O
Address	B-Application
Book	I-Application
Server	I-Application
,	O
iCal	B-Application
Server	I-Application
,	O
Wiki	B-Operating_System
Server	I-Operating_System
,	O
and	O
Web	B-Application
Server	I-Application
are	O
mostly	O
written	O
in	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
,	O
relying	O
on	O
the	O
Twisted	B-Language
framework	O
.	O
</s>
<s>
Address	B-Application
Book	I-Application
Server	I-Application
is	O
a	O
contacts	O
server	O
,	O
and	O
the	O
first	O
commercial	B-Application
server	O
to	O
have	O
implemented	O
CardDAV	B-Protocol
,	O
which	O
relies	O
on	O
the	O
WebDAV	B-Protocol
protocol	O
.	O
</s>
<s>
It	O
was	O
added	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.6	O
.	O
</s>
<s>
iCal	B-Application
Server	I-Application
is	O
the	O
first	O
commercial	B-Application
calendar	B-Application
server	I-Application
to	O
have	O
implemented	O
the	O
CalDAV	B-Protocol
standard	O
,	O
built	O
on	O
top	O
of	O
WebDAV	B-Protocol
.	O
</s>
<s>
iCal	B-Application
Server	I-Application
was	O
added	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.5	O
,	O
and	O
was	O
also	O
released	O
under	O
the	O
open-source	B-License
Apache	B-Application
License	I-Application
2.0	I-Application
as	O
Darwin	B-Application
Calendar	I-Application
Server	I-Application
.	O
</s>
<s>
The	O
server	O
,	O
named	O
""	O
,	O
is	O
a	O
daemon	B-Operating_System
background	O
service	O
.	O
</s>
<s>
It	O
is	O
currently	O
possible	O
to	O
install	O
it	O
on	O
FreeBSD	B-Operating_System
and	O
several	O
flavours	O
of	O
Linux	B-Application
.	O
</s>
<s>
The	O
server	O
uses	O
an	O
SQL	O
database	O
for	O
storage	O
of	O
calendar	B-Operating_System
data	O
.	O
</s>
<s>
iChat	B-Application
Server	I-Application
is	O
an	O
XMPP	B-Protocol
server	O
that	O
was	O
added	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Server	O
10.4	O
,	O
and	O
was	O
upgraded	O
to	O
version	O
2	O
with	O
the	O
release	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
10.5	O
Server	O
in	O
October	O
2007	O
.	O
iChat	B-Application
Server	I-Application
was	O
originally	O
based	O
on	O
jabberd	O
1.4.3	O
and	O
is	O
named	O
after	O
Apple	O
's	O
iChat	B-Protocol
online	B-Protocol
chat	I-Protocol
client	O
software	O
.	O
</s>
<s>
Version	O
2	O
of	O
the	O
software	O
is	O
based	O
on	O
jabberd2	B-Protocol
2.0s9	I-Protocol
and	O
supports	O
server	O
federation	O
,	O
which	O
allows	O
chat	B-Protocol
clients	O
to	O
talk	O
directly	O
with	O
other	O
systems	O
that	O
support	O
XMPP	B-Protocol
.	O
</s>
<s>
It	O
also	O
supports	O
server-based	O
chat	B-Protocol
archiving	O
.	O
</s>
<s>
On	O
April	O
21	O
,	O
2022	O
,	O
Apple	O
announced	O
that	O
they	O
have	O
discontinued	O
macOS	B-Application
Server	O
and	O
that	O
the	O
most	O
popular	O
features	O
(	O
Caching	O
Server	O
,	O
File	O
Sharing	O
Server	O
,	O
and	O
Time	O
Machine	O
Server	O
)	O
are	O
already	O
bundled	O
with	O
every	O
copy	O
of	O
macOS	B-Application
High	O
Sierra	O
and	O
later	O
,	O
so	O
customers	O
will	O
still	O
have	O
access	O
to	O
them	O
.	O
</s>
<s>
Existing	O
macOS	B-Application
Server	O
customers	O
can	O
still	O
download	O
and	O
use	O
the	O
app	O
with	O
macOS	B-Application
Monterey	O
.	O
</s>
