<s>
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
was	O
an	O
email	O
service	O
developed	O
by	O
Google	B-Application
.	I-Application
</s>
<s>
Inbox	O
was	O
shut	O
down	O
by	O
Google	B-Application
on	O
April	O
2	O
,	O
2019	O
.	O
</s>
<s>
Available	O
on	O
the	O
web	B-Application
,	O
and	O
through	O
mobile	O
apps	O
for	O
Android	B-Application
and	O
iOS	B-Application
,	O
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
aimed	O
to	O
improve	O
email	O
productivity	O
and	O
organization	O
through	O
several	O
key	O
features	O
.	O
</s>
<s>
Updates	O
to	O
the	O
service	O
enabled	O
an	O
undo	O
send	O
feature	O
,	O
a	O
"	O
Smart	O
Reply	O
"	O
feature	O
that	O
automatically	O
generates	O
short	O
reply	O
examples	O
for	O
certain	O
emails	O
,	O
integration	O
with	O
Google	B-Application
Calendar	I-Application
for	O
event	O
organization	O
,	O
previews	O
of	O
newsletters	O
,	O
and	O
a	O
"	O
Save	O
to	O
Inbox	O
"	O
feature	O
that	O
lets	O
users	O
save	O
links	O
for	O
later	O
use	O
.	O
</s>
<s>
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
received	O
generally	O
positive	O
reviews	O
.	O
</s>
<s>
However	O
,	O
it	O
also	O
received	O
criticism	O
,	O
particularly	O
for	O
a	O
low	O
density	O
of	O
information	O
,	O
algorithms	O
that	O
needed	O
tweaking	O
,	O
and	O
that	O
the	O
service	O
required	O
users	O
to	O
"	O
give	O
up	O
the	O
control	O
"	O
on	O
organizing	O
their	O
own	O
email	O
,	O
meaning	O
that	O
"	O
Anyone	O
who	O
already	O
has	O
a	O
system	O
for	O
organizing	O
their	O
emails	O
will	O
likely	O
find	O
themselves	O
fighting	O
Google	B-Application
's	I-Application
system	O
"	O
.	O
</s>
<s>
Google	B-Application
noted	O
in	O
March	O
2016	O
that	O
10%	O
of	O
all	O
replies	O
on	O
mobile	O
originated	O
from	O
Inbox	O
's	O
Smart	O
Reply	O
feature	O
.	O
</s>
<s>
Google	B-Application
discontinued	O
the	O
service	O
in	O
March	O
2019	O
.	O
</s>
<s>
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
scans	O
the	O
user	O
's	O
incoming	O
Gmail	B-Application
messages	O
for	O
information	O
.	O
</s>
<s>
In	O
June	O
2015	O
,	O
Google	B-Application
added	O
an	O
"	O
Undo	O
Send	O
"	O
feature	O
to	O
Inbox	O
,	O
giving	O
users	O
10	O
seconds	O
to	O
undo	O
sending	O
a	O
message	O
.	O
</s>
<s>
In	O
November	O
2015	O
,	O
Google	B-Application
added	O
"	O
Smart	O
Reply	O
"	O
functionality	O
to	O
the	O
mobile	O
apps	O
.	O
</s>
<s>
Initially	O
only	O
available	O
on	O
the	O
Android	B-Application
and	O
iOS	B-Application
mobile	O
apps	O
,	O
Smart	O
Reply	O
was	O
added	O
to	O
the	O
Inbox	O
website	O
in	O
March	O
2016	O
,	O
along	O
with	O
Google	B-Application
announcing	O
that	O
"	O
10%	O
of	O
all	O
your	O
replies	O
on	O
mobile	O
already	O
use	O
Smart	O
Reply	O
"	O
.	O
</s>
<s>
In	O
April	O
2016	O
,	O
Google	B-Application
updated	O
Inbox	O
with	O
three	O
new	O
features	O
;	O
Google	B-Application
Calendar	I-Application
event	O
organization	O
,	O
newsletter	O
previews	O
,	O
and	O
a	O
"	O
Save	O
to	O
Inbox	O
"	O
functionality	O
that	O
lets	O
users	O
save	O
links	O
for	O
later	O
use	O
rather	O
than	O
having	O
to	O
email	O
links	O
to	O
themselves	O
.	O
</s>
<s>
In	O
December	O
2017	O
,	O
Google	B-Application
introduced	O
an	O
"	O
Unsubscribe	O
"	O
card	O
that	O
lets	O
users	O
easily	O
unsubscribe	O
from	O
mailing	O
lists	O
.	O
</s>
<s>
A	O
few	O
popular	O
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
features	O
have	O
since	O
been	O
added	O
to	O
Gmail	B-Application
:	O
</s>
<s>
Nudges	O
:	O
This	O
means	O
that	O
Gmail	B-Application
moves	O
old	O
messages	O
back	O
to	O
the	O
top	O
of	O
ones	O
inbox	O
when	O
it	O
thinks	O
you	O
might	O
want	O
to	O
follow	O
up	O
or	O
reply	O
.	O
</s>
<s>
Google	B-Application
reportedly	O
said	O
that	O
they	O
eventually	O
also	O
want	O
to	O
add	O
the	O
bundles	O
feature	O
to	O
Gmail	B-Application
,	O
which	O
currently	O
is	O
only	O
available	O
in	O
Inbox	O
for	O
Gmail	B-Application
,	O
but	O
that	O
they	O
do	O
n't	O
have	O
a	O
timeline	O
for	O
that	O
.	O
</s>
<s>
By	O
March	O
2020	O
,	O
many	O
Inbox	O
features	O
were	O
still	O
missing	O
from	O
Gmail	B-Application
.	O
</s>
<s>
Inbox	B-Protocol
by	I-Protocol
Gmail	I-Protocol
was	O
announced	O
in	O
limited	O
invitation-only	O
basis	O
on	O
October	O
22	O
,	O
2014	O
,	O
available	O
on	O
the	O
web	B-Application
,	O
and	O
through	O
the	O
Android	B-Application
and	O
iOS	B-Application
mobile	O
operating	O
systems	O
.	O
</s>
<s>
It	O
's	O
remarkably	O
fast	O
and	O
smooth	O
on	O
all	O
platforms	O
,	O
and	O
far	O
better	O
on	O
iOS	B-Application
than	O
the	O
Gmail	B-Application
app	O
"	O
.	O
</s>
<s>
Anyone	O
who	O
already	O
has	O
a	O
system	O
for	O
organizing	O
their	O
emails	O
will	O
likely	O
find	O
themselves	O
fighting	O
Google	B-Application
's	I-Application
system	O
"	O
.	O
</s>
<s>
Google	B-Application
ended	O
the	O
service	O
in	O
March	O
2019	O
.	O
</s>
<s>
Google	B-Application
called	O
Inbox	O
"	O
a	O
great	O
place	O
to	O
experiment	O
with	O
new	O
ideas	O
"	O
and	O
noted	O
that	O
many	O
of	O
those	O
ideas	O
had	O
now	O
migrated	O
to	O
Gmail	B-Application
.	O
</s>
