<s>
Midori	B-Operating_System
(	O
which	O
means	O
green	O
in	O
Japanese	O
)	O
was	O
the	O
code	O
name	O
for	O
a	O
managed	O
code	O
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
being	O
developed	O
by	O
Microsoft	O
with	O
joint	O
effort	O
of	O
Microsoft	O
Research	O
.	O
</s>
<s>
It	O
had	O
been	O
reported	O
to	O
be	O
a	O
possible	O
commercial	O
implementation	O
of	O
the	O
OS	O
Singularity	B-Operating_System
,	O
a	O
research	O
project	O
begun	O
in	O
2003	O
to	O
build	O
a	O
highly	O
dependable	B-Application
OS	O
in	O
which	O
the	O
kernel	B-Operating_System
,	O
device	B-Application
drivers	I-Application
,	O
and	O
application	B-Application
software	I-Application
are	O
all	O
written	O
in	O
managed	O
code	O
.	O
</s>
<s>
It	O
was	O
designed	O
for	O
concurrency	B-Operating_System
,	O
and	O
could	O
run	O
a	O
program	O
spread	O
across	O
multiple	O
nodes	B-Protocol
at	O
once	O
.	O
</s>
<s>
Microsoft	O
had	O
mapped	O
out	O
several	O
possible	O
migration	O
paths	O
from	O
Windows	O
to	O
Midori	B-Operating_System
.	O
</s>
<s>
Midori	B-Operating_System
was	O
discontinued	O
some	O
time	O
in	O
2015	O
,	O
though	O
many	O
of	O
its	O
concepts	O
were	O
used	O
in	O
other	O
Microsoft	O
projects	O
.	O
</s>
<s>
The	O
code	O
name	O
Midori	B-Operating_System
was	O
first	O
discovered	O
through	O
the	O
PowerPoint	B-Application
presentation	O
CHESS	O
:	O
A	O
systematic	O
testing	O
tool	O
for	O
concurrent	O
software	O
.	O
</s>
<s>
Another	O
reference	O
to	O
Midori	B-Operating_System
was	O
found	O
in	O
a	O
presentation	O
shown	O
during	O
the	O
Object-Oriented	O
Programming	O
,	O
Systems	O
,	O
Languages	O
&	O
Applications	O
(	O
OOPSLA	O
)	O
October	O
2012	O
conference	O
,	O
and	O
a	O
paper	O
from	O
the	O
conference	O
's	O
proceedings	O
.	O
</s>
