<s>
Zentyal	B-Operating_System
(	O
previously	O
known	O
as	O
eBox	O
Platform	O
)	O
is	O
an	O
open	B-Application
source	I-Application
email	O
and	O
groupware	B-Application
solution	O
based	O
on	O
Ubuntu	B-Operating_System
Linux	I-Operating_System
.	O
</s>
<s>
Zentyal	B-Operating_System
implements	O
the	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
Server	I-Operating_System
protocols	O
on	O
top	O
of	O
standard	O
open	B-Application
source	I-Application
components	O
(	O
such	O
as	O
Dovecot	B-Language
,	O
Postfix	B-Application
,	O
Samba	B-Language
,	O
etc	O
.	O
)	O
</s>
<s>
in	O
order	O
to	O
provide	O
native	O
compatibility	O
with	O
Microsoft	B-Application
Outlook	I-Application
clients	O
.	O
</s>
<s>
As	O
of	O
release	O
5	O
,	O
Zentyal	B-Operating_System
has	O
dropped	O
native	O
compatibility	O
with	O
Microsoft	B-Application
Outlook	I-Application
using	O
the	O
MAPI	B-Protocol
protocol	O
via	O
OpenChange	O
,	O
due	O
to	O
unspecified	O
issues	O
.	O
</s>
<s>
The	O
email	O
and	O
groupware	B-Application
protocols	O
supported	O
by	O
Zentyal	B-Operating_System
are	O
ActiveSync	B-Operating_System
,	O
SMTP	B-Protocol
,	O
POP	B-Protocol
,	O
IMAP	B-Protocol
,	O
CalDAV	B-Protocol
,	O
CardDAV	B-Protocol
and	O
Active	B-Protocol
Directory	I-Protocol
.	O
</s>
<s>
Zentyal	B-Operating_System
is	O
distributed	O
in	O
two	O
packages	O
:	O
Zentyal	B-Operating_System
Server	O
for	O
SMBs	O
and	O
Zentyal	B-Operating_System
Cloud	O
for	O
hosting	O
providers	O
.	O
</s>
<s>
Zentyal	B-Operating_System
Server	O
has	O
a	O
development	O
edition	O
that	O
is	O
freely	O
downloadable	O
and	O
its	O
source	O
code	O
is	O
available	O
under	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
In	O
May	O
2015	O
,	O
Zentyal	B-Operating_System
organized	O
with	O
Microsoft	O
's	O
sponsorship	O
the	O
first	O
Protocols	O
Plugfest	O
in	O
Europe	O
,	O
aimed	O
at	O
open	B-Application
source	I-Application
communities	O
and	O
technology	O
companies	O
to	O
present	O
,	O
test	O
and	O
discuss	O
technical	O
issues	O
and	O
content	O
around	O
open	O
protocols	O
and	O
interoperability	O
.	O
</s>
<s>
In	O
2016	O
Zentyal	B-Operating_System
S.L.	O
</s>
<s>
In	O
2019	O
Zentyal	B-Operating_System
CEO	O
,	O
Ignacio	O
Correas	O
,	O
was	O
found	O
guilty	O
of	O
funds	O
embezzlement	O
.	O
</s>
