<s>
Hosted	B-Application
Exchange	I-Application
is	O
a	O
service	O
in	O
the	O
telecommunications	O
industry	O
whereby	O
a	O
provider	O
makes	O
a	O
Microsoft	O
email	O
box	O
and	O
space	O
available	O
on	O
a	O
server	O
so	O
its	O
clients	O
can	O
host	O
their	O
data	O
on	O
the	O
server	O
.	O
</s>
<s>
The	O
e-mails	O
are	O
routed	O
to	O
a	O
laptop	B-Device
or	O
mobile	O
phone	O
through	O
push	B-General_Concept
technology	I-General_Concept
.	O
</s>
<s>
The	O
prerequisite	O
for	O
the	O
use	O
of	O
this	O
function	O
is	O
a	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
.	O
</s>
<s>
These	O
systems	O
are	O
available	O
from	O
various	O
service	O
providers	O
including	O
Microsoft	O
itself	O
with	O
Exchange	B-Operating_System
Server	I-Operating_System
hosted	O
as	O
a	O
service	O
.	O
</s>
