<s>
Due	O
to	O
the	O
service	O
's	O
vertical	O
integration	O
,	O
a	O
Hey	O
mailbox	O
cannot	O
be	O
incorporated	O
into	O
other	O
email	O
services	O
or	O
stand-alone	O
email	B-Protocol
clients	I-Protocol
.	O
</s>
<s>
Around	O
the	O
time	O
of	O
Hey	O
's	O
launch	O
,	O
a	O
stand-off	O
between	O
Basecamp	O
and	O
Apple	O
Inc	O
.	O
over	O
Apple	O
's	O
policy	O
on	O
in-app	O
purchases	O
in	O
apps	O
hosted	O
by	O
its	O
App	B-Application
Store	I-Application
was	O
the	O
cause	O
of	O
significant	O
media	O
attention	O
upon	O
Apple	O
's	O
policies	O
.	O
</s>
