<s>
The	O
Mozilla	B-Application
Calendar	I-Application
Project	I-Application
was	O
the	O
name	O
for	O
the	O
Mozilla	B-Operating_System
project	I-Operating_System
that	O
led	O
to	O
the	O
development	O
of	O
Sunbird	B-Language
calendar	O
application	O
and	O
the	O
Lightning	B-Language
integrated	O
calendar	O
.	O
</s>
<s>
Sunbird	B-Language
and	O
Lightning	B-Language
are	O
both	O
free	B-Application
software	I-Application
,	O
released	O
under	O
the	O
Mozilla	B-Operating_System
tri-license	B-License
:	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
,	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
and	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
.	O
</s>
<s>
The	O
project	O
started	O
with	O
a	O
single	O
extension	B-Operating_System
for	O
the	O
Mozilla	B-Operating_System
projects	I-Operating_System
known	O
as	O
Mozilla	B-Application
Calendar	I-Application
.	O
</s>
<s>
It	O
was	O
a	O
free	B-Application
software	I-Application
/	O
open	B-Application
source	I-Application
calendar	O
and	O
personal	B-Application
information	I-Application
manager	I-Application
based	O
on	O
the	O
open	O
iCalendar	O
standard	O
.	O
</s>
<s>
It	O
was	O
developed	O
to	O
be	O
part	O
of	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
project	O
.	O
</s>
<s>
However	O
,	O
Mozilla	B-Language
Sunbird	I-Language
and	O
the	O
Lightning	B-Language
project	O
have	O
replaced	O
the	O
Mozilla	B-Application
Calendar	I-Application
.	O
</s>
<s>
As	O
with	O
other	O
Mozilla	B-Operating_System
projects	I-Operating_System
,	O
Mozilla	B-Application
Calendar	I-Application
was	O
cross-platform	B-Operating_System
,	O
and	O
used	O
the	O
XUL	B-Application
user	O
interface	O
language	O
.	O
</s>
<s>
It	O
worked	O
with	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
and	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
The	O
Mozilla	B-Application
Calendar	I-Application
project	I-Application
was	O
announced	O
by	O
the	O
Mozilla	B-Operating_System
Organization	I-Operating_System
(	O
now	O
the	B-Operating_System
Mozilla	I-Operating_System
Foundation	I-Operating_System
)	O
in	O
October	O
2001	O
.	O
</s>
<s>
The	O
original	O
code	O
,	O
used	O
by	O
Mozilla	B-Application
Calendar	I-Application
and	O
now	O
the	O
Mozilla	B-Language
Sunbird	I-Language
,	O
was	O
donated	O
by	O
OEone	O
(	O
now	O
Axentra	O
)	O
,	O
who	O
had	O
developed	O
it	O
for	O
use	O
in	O
their	O
Mozilla-based	O
HomeBase	O
DESKTOP	O
system	O
.	O
</s>
<s>
The	O
initial	O
plan	O
was	O
for	O
Mozilla	B-Application
Calendar	I-Application
to	O
eventually	O
be	O
integrated	O
into	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
alongside	O
the	O
other	O
components	O
.	O
</s>
<s>
However	O
,	O
this	O
plan	O
was	O
dropped	O
when	O
Mozilla	B-Operating_System
decided	O
to	O
focus	O
on	O
its	O
nascent	O
standalone	O
applications	O
rather	O
than	O
the	O
integrated	O
suite	O
.	O
</s>
<s>
Mozilla	B-Application
Calendar	I-Application
could	O
be	O
installed	O
as	O
a	O
component	O
in	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
,	O
or	O
as	O
an	O
extension	B-Operating_System
in	O
either	O
the	O
Mozilla	B-Application
Firefox	I-Application
standalone	O
browser	O
or	O
the	O
Mozilla	B-Application
Thunderbird	I-Application
standalone	O
mail	O
and	O
newsgroups	O
client	O
.	O
</s>
<s>
The	O
extension	B-Operating_System
has	O
now	O
been	O
replaced	O
by	O
the	O
Lightning	B-Language
project	O
,	O
a	O
project	O
with	O
similar	O
features	O
,	O
but	O
with	O
tighter	O
integration	O
with	O
Thunderbird	B-Application
.	O
</s>
