<s>
Lookeen	B-Operating_System
is	O
an	O
enterprise	B-Application
search	I-Application
and	O
desktop	B-Application
search	I-Application
product	O
released	O
in	O
2008	O
by	O
Axonic	O
Informationssysteme	O
GmbH	O
.	O
</s>
<s>
Lookeen	B-Operating_System
was	O
developed	O
in	O
2007	O
as	O
an	O
email	O
search	O
tool	O
replacement	O
for	O
Lookout	O
,	O
which	O
left	O
the	O
market	O
when	O
it	O
was	O
purchased	O
by	O
Microsoft	O
.	O
</s>
<s>
Lookeen	B-Operating_System
enables	O
users	O
to	O
search	O
for	O
files	O
on	O
their	O
local	B-Device
drives	I-Device
,	O
Microsoft	B-Application
Outlook	I-Application
and	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
files	O
,	O
and	O
any	O
connected	O
network	B-Application
drives	I-Application
from	O
standard	O
or	O
virtual	B-Application
desktops	I-Application
.	O
</s>
<s>
Lookeen	B-Operating_System
won	O
the	O
About.com	O
Reader	O
's	O
Choice	O
award	O
for	O
Best	O
Outlook	B-Application
Add-In	B-Application
in	O
2010	O
and	O
2011	O
,	O
and	O
has	O
been	O
reviewed	O
by	O
PCMagazine	O
,	O
The	O
Atlantic	O
,	O
Inc	O
Magazine	O
,	O
PCWorld	O
,	O
and	O
Ghacks	O
,	O
among	O
others	O
Lookeen	B-Operating_System
was	O
also	O
one	O
of	O
29	O
productivity	O
apps	O
recommended	O
in	O
an	O
article	O
on	O
TechCrunch	O
in	O
September	O
2015	O
.	O
</s>
<s>
Lookeen	B-Operating_System
was	O
also	O
mentioned	O
as	O
a	O
3rd	O
party	O
search	O
utility	O
by	O
The	O
New	O
York	O
Times	O
in	O
December	O
2016	O
.	O
</s>
<s>
Lookeen	B-Operating_System
is	O
built	O
upon	O
the	O
open	B-Application
source	I-Application
software	I-Application
,	O
Lucene	B-Language
.	O
</s>
<s>
The	O
index	O
framework	O
builds	O
an	O
inverted	B-Algorithm
index	I-Algorithm
to	O
allow	O
fast	O
full	O
text	O
searches	O
within	O
indexed	O
content	O
.	O
</s>
<s>
Lookeen	B-Operating_System
uses	O
Microsoft	O
add-in	B-Application
technology	O
to	O
integrate	O
a	O
search	O
bar	O
and	O
ribbon	O
into	O
the	O
Outlook	B-Application
client	O
.	O
</s>
<s>
Axonic	O
launched	O
enterprise	B-Application
search	I-Application
capabilities	O
in	O
2012	O
with	O
Lookeen	B-Operating_System
Server	O
,	O
a	O
Microsoft	O
server-based	O
index	O
which	O
can	O
deliver	O
search	O
results	O
to	O
multiple	B-Application
desktop	I-Application
clients	O
.	O
</s>
<s>
A	O
free	O
version	O
,	O
Lookeen	B-Operating_System
Free	O
,	O
was	O
released	O
in	O
2015	O
.	O
</s>
