<s>
CrossOver	B-Operating_System
is	O
a	O
Microsoft	B-Application
Windows	I-Application
compatibility	B-General_Concept
layer	I-General_Concept
available	O
for	O
Linux	B-Application
,	O
macOS	B-Operating_System
,	O
and	O
ChromeOS	B-Operating_System
.	O
</s>
<s>
This	O
compatibility	B-General_Concept
layer	I-General_Concept
enables	O
many	O
Windows-based	O
applications	B-Application
to	O
run	O
on	O
Linux	B-Application
operating	I-Application
systems	I-Application
,	O
macOS	B-Operating_System
,	O
or	O
ChromeOS	B-Operating_System
.	O
</s>
<s>
CrossOver	B-Operating_System
is	O
developed	O
by	O
CodeWeavers	O
and	O
based	O
on	O
Wine	B-Application
,	O
an	O
open-source	B-Application
Windows	B-Application
compatibility	B-General_Concept
layer	I-General_Concept
.	O
</s>
<s>
CodeWeavers	O
modifies	O
the	O
Wine	B-Application
source	O
code	O
,	O
applies	O
compatibility	O
patches	O
,	O
adds	O
configuration	B-General_Concept
tools	O
that	O
are	O
more	O
user-friendly	B-General_Concept
,	O
automated	O
installation	O
scripts	O
,	O
and	O
provides	O
technical	B-General_Concept
support	I-General_Concept
.	O
</s>
<s>
All	O
changes	O
made	O
to	O
the	O
Wine	B-Application
source	O
code	O
are	O
covered	O
by	O
the	O
LGPL	B-Application
and	O
publicly	O
available	O
.	O
</s>
<s>
CodeWeavers	O
maintains	O
an	O
online	O
database	O
listing	O
how	O
well	O
various	O
Windows	B-Application
applications	I-Application
perform	O
under	O
CrossOver	B-Operating_System
.	O
</s>
<s>
CrossOver	B-Operating_System
Linux	I-Operating_System
is	O
the	O
original	O
version	O
of	O
CrossOver	B-Operating_System
.	O
</s>
<s>
It	O
aims	O
to	O
properly	O
integrate	O
with	O
the	O
GNOME	B-Application
and	O
KDE	B-Application
desktop	O
environments	O
so	O
that	O
Windows	B-Application
applications	I-Application
will	O
run	O
seamlessly	O
on	O
Linux	B-Application
distributions	O
.	O
</s>
<s>
Prior	O
to	O
version	O
6	O
it	O
was	O
called	O
CrossOver	B-Operating_System
Office	I-Operating_System
.	O
</s>
<s>
CrossOver	B-Operating_System
Linux	I-Operating_System
was	O
originally	O
offered	O
in	O
Standard	O
and	O
Professional	O
editions	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Linux	I-Operating_System
Standard	O
was	O
designed	O
for	O
a	O
single	O
user	O
account	O
on	O
a	O
single	O
machine	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Linux	I-Operating_System
Professional	O
provided	O
enhanced	O
deployment	O
and	O
management	O
features	O
for	O
corporate	O
users	O
,	O
as	O
well	O
as	O
multiple	O
user	O
accounts	O
per	O
machine	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
CrossOver	B-Operating_System
Linux	I-Operating_System
11	O
in	O
2012	O
these	O
different	O
editions	O
have	O
all	O
merged	O
into	O
a	O
single	O
CrossOver	B-Operating_System
Linux	I-Operating_System
product	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Mac	O
was	O
released	O
on	O
January	O
10	O
,	O
2007	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
CrossOver	B-Operating_System
Mac	O
7	O
on	O
June	O
17	O
,	O
2008	O
,	O
CrossOver	B-Operating_System
Mac	O
was	O
divided	O
into	O
Standard	O
and	O
Pro	O
editions	O
like	O
CrossOver	B-Operating_System
Linux	I-Operating_System
.	O
</s>
<s>
The	O
Standard	O
version	O
included	O
six	O
months	O
of	O
support	O
and	O
upgrades	O
,	O
while	O
the	O
Pro	O
version	O
included	O
one	O
year	O
of	O
support	O
and	O
upgrades	O
,	O
along	O
with	O
a	O
free	O
copy	O
of	O
CrossOver	B-Operating_System
Games	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
CrossOver	B-Operating_System
Mac	O
11	O
in	O
2012	O
these	O
different	O
editions	O
were	O
all	O
merged	O
into	O
a	O
single	O
CrossOver	B-Operating_System
Mac	O
product	O
.	O
</s>
<s>
In	O
2019	O
,	O
macOS	B-Device
Catalina	I-Device
went	O
64-bit	O
only	O
and	O
eliminated	O
support	O
for	O
32-bit	O
programs	O
and	O
libraries	O
.	O
</s>
<s>
In	O
December	O
2019	O
Codeweavers	O
released	O
CrossOver	B-Operating_System
19	O
,	O
providing	O
support	O
for	O
32	O
bit	O
Windows	B-Application
applications	I-Application
on	O
an	O
operating	O
system	O
with	O
no	O
32	O
bit	O
libraries	O
solving	O
this	O
problem	O
.	O
</s>
<s>
The	O
technique	O
,	O
known	O
as	O
"	O
wine32on64	O
"	O
,	O
requires	O
using	O
modified	O
LLVM	B-Application
to	O
build	O
additional	O
thunk	B-Application
code	O
that	O
allows	O
running	O
32-bit	O
programs	O
in	O
a	O
64-bit	O
wine	B-Application
.	O
</s>
<s>
A	O
standard	O
copy	O
of	O
CrossOver	B-Operating_System
now	O
includes	O
the	O
functionality	O
of	O
CrossOver	B-Operating_System
Games	O
,	O
CrossOver	B-Operating_System
Standard	O
,	O
and	O
CrossOver	B-Operating_System
Professional	O
editions	O
.	O
</s>
<s>
These	O
older	O
individual	O
versions	O
of	O
Crossover	B-Operating_System
have	O
since	O
been	O
retired	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Games	O
,	O
announced	O
on	O
10	O
March	O
2008	O
,	O
was	O
a	O
product	O
intended	O
to	O
let	O
users	O
play	O
a	O
broad	O
range	O
of	O
games	O
by	O
providing	O
current	O
Wine	B-Application
patches	O
.	O
</s>
<s>
The	O
expectation	O
was	O
that	O
it	O
would	O
update	O
on	O
a	O
weekly	O
to	O
monthly	O
schedule	O
in	O
order	O
to	O
incorporate	O
the	O
latest	O
Wine	B-Application
programming	O
work	O
being	O
accepted	O
.	O
</s>
<s>
In	O
contrast	O
the	O
general	O
CrossOver	B-Operating_System
Office	I-Operating_System
product	O
focused	O
more	O
on	O
stability	O
and	O
productivity	O
software	O
,	O
and	O
had	O
a	O
much	O
slower	O
beta	O
and	O
release	O
schedule	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Games	O
was	O
n't	O
able	O
to	O
release	O
updates	O
with	O
enough	O
frequency	O
to	O
justify	O
its	O
separate	O
production	O
track	O
and	O
was	O
discontinued	O
in	O
2012	O
.	O
</s>
<s>
It	O
was	O
merged	O
back	O
into	O
a	O
unified	O
CrossOver	B-Operating_System
product	O
.	O
</s>
<s>
CrossOver	B-Operating_System
Server	O
was	O
a	O
specialized	O
version	O
of	O
CrossOver	B-Operating_System
Linux	I-Operating_System
which	O
allowed	O
Windows	B-Application
applications	I-Application
to	O
run	O
on	O
thin-client	B-Device
systems	O
.	O
</s>
<s>
It	O
was	O
discontinued	O
in	O
2007	O
as	O
many	O
of	O
its	O
features	O
were	O
present	O
in	O
the	O
CrossOver	B-Operating_System
Linux	I-Operating_System
Pro	O
edition	O
.	O
</s>
<s>
More	O
than	O
100,000	O
people	O
pledged	O
,	O
so	O
CodeWeavers	O
allowed	O
any	O
person	O
in	O
the	O
world	O
to	O
download	O
and	O
register	O
a	O
copy	O
of	O
CrossOver	B-Operating_System
Linux	I-Operating_System
or	O
CrossOver	B-Operating_System
Mac	O
.	O
</s>
