<s>
The	O
Lemonade	B-Protocol
Profile	I-Protocol
is	O
a	O
set	O
of	O
protocols	O
and	O
mandatory	O
extensions	O
which	O
provides	O
email	O
access	O
to	O
diverse	O
environments	O
,	O
including	O
mobile	O
handsets	O
and	O
other	O
resource	O
constrained	O
devices	O
.	O
</s>
<s>
It	O
is	O
the	O
product	O
of	O
an	O
IETF	O
Working	O
Group	O
,	O
and	O
is	O
largely	O
based	O
on	O
pre-existing	O
specifications	O
,	O
including	O
IMAP	B-Protocol
and	O
the	O
Message	O
Submission	O
profile	O
of	O
SMTP	B-Protocol
.	O
</s>
<s>
Unlike	O
many	O
other	O
mobile	B-General_Concept
email	I-General_Concept
proposals	O
,	O
including	O
Push-IMAP	B-Protocol
,	O
the	O
Lemonade	B-Protocol
Profile	I-Protocol
does	O
not	O
provide	O
for	O
message	O
submission	O
via	O
IMAP	B-Protocol
,	O
but	O
instead	O
allows	O
the	O
MSA	B-Protocol
to	O
pull	O
message	O
data	O
directly	O
from	O
the	O
IMAP	B-Protocol
store	O
in	O
a	O
secure	O
manner	O
.	O
</s>
<s>
This	O
allows	O
the	O
protocols	O
to	O
continue	O
to	O
leverage	O
the	O
vast	O
body	O
of	O
work	O
on	O
SMTP	B-Protocol
,	O
and	O
also	O
means	O
that	O
any	O
traditional	O
IMAP	B-Protocol
client	O
can	O
interoperate	O
fully	O
with	O
a	O
Lemonade	O
service	O
.	O
</s>
<s>
Rather	O
than	O
providing	O
a	O
Push	B-General_Concept
e-mail	I-General_Concept
mechanism	O
,	O
The	O
Lemonade	B-Protocol
Profile	I-Protocol
relies	O
on	O
the	O
existing	O
IMAP	B-Protocol
capability	O
to	O
provide	O
short	O
notification	O
messages	O
at	O
any	O
time	O
,	O
and	O
includes	O
support	O
for	O
the	O
IDLE	O
command	O
.	O
</s>
<s>
When	O
there	O
is	O
ongoing	O
activity	O
between	O
the	O
server	O
and	O
the	O
client	O
,	O
IMAP	B-Protocol
will	O
automatically	O
inform	O
the	O
client	O
of	O
the	O
presence	O
of	O
new	O
messages	O
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
IDLE	O
is	O
often	O
cited	O
as	O
providing	O
a	O
user	O
experience	O
similar	O
to	O
that	O
of	O
Push	B-General_Concept
e-mail	I-General_Concept
.	O
</s>
<s>
Other	O
Lemonade	O
features	O
include	O
the	O
ability	O
to	O
forward	O
a	O
message	O
,	O
part	O
of	O
a	O
message	O
or	O
message	O
attachment	O
to	O
another	O
party	O
—	O
without	O
first	O
downloading	O
the	O
relevant	O
message	O
parts	O
to	O
the	O
handset	O
(	O
this	O
involves	O
extensions	O
to	O
both	O
IMAP	B-Protocol
and	O
SMTP	B-Protocol
)	O
as	O
well	O
as	O
quick	O
and	O
efficient	O
re-synchronisation	O
of	O
client	O
with	O
server	O
in	O
the	O
event	O
of	O
a	O
broken	O
connection	O
.	O
</s>
<s>
Lemonade	O
does	O
not	O
intend	O
to	O
provide	O
only	O
for	O
PDAs	B-Application
and	O
smartphones	B-Application
,	O
but	O
to	O
include	O
laptops	O
on	O
trains	O
and	O
planes	O
,	O
e-mail	O
access	O
over	O
satellite	O
links	O
,	O
and	O
other	O
environments	O
with	O
constraints	O
on	O
bandwidth	O
,	O
latency	O
,	O
and	O
client	O
memory	O
.	O
</s>
<s>
Although	O
a	O
draft	O
was	O
produced	O
describing	O
Oracle	B-Application
's	O
Push-IMAP	B-Protocol
,	O
it	O
has	O
never	O
been	O
the	O
product	O
of	O
an	O
IETF	O
working	O
group	O
,	O
nor	O
has	O
it	O
been	O
considered	O
for	O
publication	O
as	O
an	O
RFC	O
.	O
</s>
<s>
Instead	O
,	O
it	O
is	O
essentially	O
a	O
proprietary	O
protocol	O
that	O
has	O
been	O
opened	O
in	O
order	O
to	O
provide	O
useful	O
input	O
into	O
the	O
formation	O
of	O
the	O
Lemonade	B-Protocol
Profile	I-Protocol
.	O
</s>
<s>
Early	O
investment	O
by	O
some	O
companies	O
,	O
including	O
Consilient	O
and	O
Oracle	B-Application
,	O
have	O
led	O
to	O
some	O
confusion	O
about	O
its	O
status	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
writing	O
,	O
P-IMAP	B-Protocol
has	O
more	O
functionality	O
than	O
Lemonade	O
's	O
support	O
for	O
IMAP	B-Protocol
's	O
IDLE	O
command	O
,	O
at	O
a	O
cost	O
that	O
it	O
is	O
more	O
distant	O
from	O
existing	O
IMAP	B-Protocol
.	O
</s>
