<s>
The	O
Microsoft	B-Operating_System
Office	I-Operating_System
XML	I-Operating_System
formats	I-Operating_System
are	O
XML-based	O
document	O
formats	O
(	O
or	O
XML	B-Language
schemas	I-Language
)	O
introduced	O
in	O
versions	O
of	O
Microsoft	B-Application
Office	I-Application
prior	O
to	O
Office	B-Application
2007	I-Application
.	O
</s>
<s>
Microsoft	B-Operating_System
Office	I-Operating_System
XP	I-Operating_System
introduced	O
a	O
new	O
XML	B-Protocol
format	O
for	O
storing	O
Excel	B-Application
spreadsheets	B-Application
and	O
Office	B-General_Concept
2003	I-General_Concept
added	O
an	O
XML-based	O
format	O
for	O
Word	O
documents	O
.	O
</s>
<s>
These	O
formats	O
were	O
succeeded	O
by	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
(	O
ECMA-376	B-Operating_System
)	O
in	O
Microsoft	B-Application
Office	I-Application
2007	I-Application
.	O
</s>
<s>
Besides	O
differences	O
in	O
the	O
schema	O
,	O
there	O
are	O
several	O
other	O
differences	O
between	O
the	O
earlier	O
Office	O
XML	B-Language
schema	I-Language
formats	O
and	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
.	O
</s>
<s>
Whereas	O
the	O
data	O
in	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
documents	I-Operating_System
is	O
stored	O
in	O
multiple	O
parts	O
and	O
compressed	O
in	O
a	O
ZIP	B-General_Concept
file	I-General_Concept
conforming	O
to	O
the	O
Open	O
Packaging	O
Conventions	O
,	O
Microsoft	B-Operating_System
Office	I-Operating_System
XML	I-Operating_System
formats	I-Operating_System
are	O
stored	O
as	O
plain	O
single	O
monolithic	O
XML	B-Protocol
files	O
(	O
making	O
them	O
quite	O
large	O
,	O
compared	O
to	O
OOXML	B-Operating_System
and	O
the	O
Microsoft	B-Application
Office	I-Application
legacy	O
binary	O
formats	O
)	O
.	O
</s>
<s>
Also	O
,	O
embedded	O
items	O
like	O
pictures	O
are	O
stored	O
as	O
binary	O
encoded	O
blocks	O
within	O
the	O
XML	B-Protocol
.	O
</s>
<s>
In	O
case	O
of	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
,	O
the	O
header	O
,	O
footer	O
,	O
comments	O
of	O
a	O
document	O
etc	O
.	O
</s>
<s>
XML	B-Protocol
Spreadsheet	B-Application
documents	O
cannot	O
store	O
Visual	B-Language
Basic	I-Language
for	I-Language
Applications	I-Language
macros	O
,	O
auditing	O
tracer	O
arrows	O
,	O
chart	O
and	O
other	O
graphic	O
objects	O
,	O
custom	O
views	O
,	O
drawing	O
object	O
layers	O
,	O
outlining	O
,	O
scenarios	O
,	O
shared	O
workbook	O
information	O
and	O
user-defined	O
function	O
categories	O
.	O
</s>
<s>
In	O
contrast	O
,	O
the	O
newer	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
formats	O
support	O
full	O
document	O
fidelity	O
.	O
</s>
<s>
Poor	O
backward	O
compatibility	O
with	O
the	O
version	O
of	O
Word/Excel	O
prior	O
to	O
the	O
one	O
in	O
which	O
they	O
were	O
introduced	O
.	O
</s>
<s>
For	O
example	O
,	O
Word	O
2002	O
cannot	O
open	O
Word	O
2003	O
XML	B-Protocol
files	O
unless	O
a	O
third-party	O
converter	O
add-in	O
is	O
installed	O
.	O
</s>
<s>
Microsoft	O
has	O
released	O
a	O
Word	O
2003	O
XML	B-Protocol
Viewer	O
which	O
allows	O
WordProcessingML	B-Operating_System
files	O
saved	O
by	O
Word	O
2003	O
to	O
be	O
viewed	O
as	O
HTML	B-Language
from	O
within	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
For	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
,	O
Microsoft	O
provides	O
converters	O
for	O
Office	B-General_Concept
2003	I-General_Concept
,	O
Office	B-Operating_System
XP	I-Operating_System
and	O
Office	O
2000	O
.	O
</s>
<s>
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
formats	O
are	O
also	O
defined	O
for	O
PowerPoint	B-Application
2007	I-Application
,	O
equation	O
editing	O
(	O
Office	O
MathML	O
)	O
,	O
vector	O
drawing	O
,	O
charts	O
and	O
text	O
art	O
(	O
DrawingML	O
)	O
.	O
</s>
