<s>
The	O
Internet	B-Application
Messaging	I-Application
Program	I-Application
or	O
IMP	O
is	O
a	O
webmail	B-Protocol
client	O
.	O
</s>
<s>
It	O
can	O
be	O
used	O
to	O
access	O
e-mail	O
stored	O
on	O
an	O
IMAP	B-Protocol
server	I-Protocol
.	O
</s>
<s>
IMP	O
is	O
written	O
in	O
PHP	B-Application
and	O
a	O
component	O
of	O
the	O
collaborative	B-Application
software	I-Application
suite	O
Horde	B-Language
.	O
</s>
<s>
It	O
is	O
included	O
with	O
cPanel	B-Protocol
and	O
Plesk	B-Language
installations	O
as	O
a	O
webmail	B-Protocol
client	O
.	O
</s>
<s>
It	O
often	O
integrates	O
email	O
,	O
calendar	B-Application
,	O
address	B-Operating_System
book	I-Operating_System
,	O
notes	O
,	O
tasks	O
,	O
filters	O
and	O
a	O
newsreader	B-Protocol
with	O
cPanel	B-Protocol
.	O
</s>
<s>
Internet	B-Application
Messaging	I-Application
Program	I-Application
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
subject	O
to	O
the	O
terms	O
of	O
the	O
GPL-2.0-only	B-License
license	O
.	O
</s>
<s>
A	O
constant	O
stream	O
of	O
feature	O
requests	O
not	O
all	O
fitting	O
for	O
a	O
webmail	B-Protocol
application	O
led	O
to	O
the	O
development	O
of	O
a	O
more	O
generic	O
web	B-Application
application	I-Application
backbone	O
:	O
the	O
Horde	B-Language
framework	I-Language
.	O
</s>
<s>
The	O
release	O
of	O
IMP	O
3.0	O
and	O
Horde	B-Language
2.0	O
was	O
the	O
first	O
one	O
with	O
two	O
truly	O
separate	O
components	O
.	O
</s>
<s>
Since	O
then	O
any	O
deployment	O
of	O
IMP	O
can	O
only	O
run	O
on	O
top	O
of	O
a	O
Horde	B-Language
installation	O
.	O
</s>
<s>
SAPO	O
uses	O
IMP	O
to	O
provide	O
several	O
million	O
users	O
with	O
a	O
webmail	B-Protocol
platform	O
.	O
</s>
<s>
The	O
company	O
also	O
sponsored	O
the	O
initial	O
development	O
of	O
the	O
dynamic	O
AJAX	B-Device
variant	O
of	O
IMP	O
which	O
was	O
released	O
as	O
a	O
separate	O
package	O
-	O
named	O
DIMP	O
-	O
with	O
the	O
release	O
of	O
Horde	B-Language
3.2	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
Horde	B-Language
4.0	O
the	O
three	O
existing	O
views	O
were	O
collapsed	O
into	O
the	O
original	O
IMP	O
package	O
again	O
.	O
</s>
<s>
In	O
addition	O
another	O
mobile	O
view	O
for	O
smartphones	O
was	O
added	O
based	O
on	O
the	O
jQuery	B-Language
Mobile	I-Language
JavaScript	B-Language
framework	O
.	O
</s>
