The set of fonts delivered with M…oSoft Office 2011 behave well under 10.7.2 in Pages as in other apps.
What the OP get is the normal behavior.
When an Apple application apply Bold to a font, it doesn't build a faux style like M…oSoft products do.
It apply the font designed as bold by the font author.
When we ask Arial bolded the font used is not "Arial", it's "Arial-BoldMT"
When we ask Times New Roman bolded, the font used is not "TimesNewRomanPSMT", it's "TimesNewRomanPS-BoldMT".
Below you see the styles descriptors with the fonts names.

What the OP get isn't what he assumed to get but it's the logical behavior. The process export the correct fonts, those built by the fonts designers.
If something requires some changes, it's Word's behavior which doesn't take care of Intellectual Property (when it's related to products which aren't designed by M…oSoft).
Two or three days ago, in a thread, I posted a script building a list of every fonts installed in the active system allowing us to know exactly which font is used in applications designed by Apple.
Here is an enhanced version.
--{code}
--[SCRIPT list_fonts_and_styles]
(*
Yvan KOENIG (VALLAURIS, France)
2011/12/11 using "tell every typeface" dramatically fasten the script.
2011/12/12 build automatically the Bold table
*)
property liste_des_polices : {}
property liste_display_name : {}
property liste_des_noms_de_famille : {}
property liste_des_styles : {}
property liste_PostScript_name : {}
on run
local rapport, IF_loc, OR_loc, MAX_loc, ROW_loc, LOOKUP_loc, delim_loc, nb_bolds
tell application "Font Book" to tell every typeface
(*
Extract the list of names of available type faces *)
set my liste_des_polices to name
set my liste_display_name to displayed name
(*
Extract the list of family names of available type faces *)
set my liste_des_noms_de_famille to family name
(*
Extract the list of style names of available type faces *)
set my liste_des_styles to style name
set my liste_PostScript_name to PostScript name
end tell -- FontBook…
(*
Add family name and style name at end of every item in the list of names *)
repeat with i from 1 to count of my liste_des_polices
set itemi of my liste_des_polices to my recolle({itemi of my liste_des_polices, itemi of my liste_display_name, itemi of my liste_des_noms_de_famille, itemi of my liste_des_styles, itemi of my liste_PostScript_name}, tab)
end repeat
(*
Build a file path *)
set rapport to (path to temporary items as text) & "Fonts List.txt"
(*
Write the list in a text file *)
my writeTo(rapport, my recolle({my recolle({"name", "display name", "family name", "style name", "PostScript name"}, tab), my liste_des_polices}, return), text, false)
(*
Open the text file in Numbers *)
tell application "Numbers"
openrapport
(*
Get several localized functions names *)
set IF_loc to my getLocalizedTabularString("Numbers", "IF") & "("
set OR_loc to my getLocalizedTabularString("Numbers", "OR")
set MAX_loc to my getLocalizedTabularString("Numbers", "MAX")
set ROW_loc to my getLocalizedTabularString("Numbers", "ROW") & "()"
set LOOKUP_loc to my getLocalizedTabularString("Numbers", "LOOKUP") & "("
set delim_loc to my getLocalizedDelimiter()
tell document 1 to tell sheet 1
set name of table 1 to "Main"
tell table 1
add column after last column
-- set nbr to count rows
set selection range to range "A1" (* Required before creating an header row *)
(*
Create an header row *)
my selectSubMenu("Numbers", 6, 10, 1 + 1) (* Create one header row *)
(*
Fill the header row *)
repeat with c from 1 to 5
tell column c to set value of cell 1 to value of cell 2
end repeat
(*
Remove the original title row *)
removerow 2
(*
Insert in F2 the formula : =IF(OR(D2="Bold",D2="10 Bold"),MAX(F$1:F1)+1,"") *)
set value of cell "F2" to "=" & IF_loc & OR_loc & "(D2=" & quote & "Bold" & quote & delim_loc & "D2=" & quote & "10 Bold" & quote & ")" & delim_loc & MAX_loc & "(F$1:F1)+1" & delim_loc & quote & quote & ")"
(*
Prepare the column for Fill Down *)
set selection range to range ("F2:F" & (count rows))
(*
Apply Fill Down *)
my selectSubMenu("Numbers", 5, 10, 2) (* Fill Down *)
(*
Replace the formulas by their results to allow us to insert the formula =MAX(F) in F1 *)
my selectmenu("Numbers", 4, 5) (* Copy *)
my selectmenu("Numbers", 4, 8) (* Paste Values *)
(*
Insert the formula = MAX(F) to get the count of bold fonts available ) *)
set value of cell "F1" to "=" & MAX_loc & "(F)"
(*
Extract the count of bold fonts available ) *)
set nb_bolds to value of cell "F1"
end tell -- table 1
make new table with properties {name:"Bold", column count:3, row count:nb_bolds + 1}
tell table "Bold"
removecolumn 1 (* No need for header column *)
removerow 1 (* No need for header row *)
(*
Insert in A1 the formula : =LOOKUP(ROW(),Main :: $F,Main :: C) *)
set value of cell "A1" to "=" & LOOKUP_loc & ROW_loc & delim_loc & "Main :: $F" & delim_loc & "Main :: C)"
set selection range to range "A1:B1"
my selectSubMenu("Numbers", 5, 10, 1) (* Fill to Right *)
set selection range to range ("A1:B" & (count rows))
my selectSubMenu("Numbers", 5, 10, 2) (* Fill Down *)
end tell -- table "Bold"
end tell -- document
end tell -- Numbers
(*
Clear the properties used to accelerate the script. *)
set my liste_des_polices to {}
set my liste_display_name to {}
set my liste_des_noms_de_famille to {}
set my liste_des_styles to {}
set my liste_PostScript_name to {}
end run
--=====
on decoupe(t, d)
local oTIDs, L
set oTIDs to AppleScript's text item delimiters
set AppleScript's text item delimiters to d
set L to text items of t
set AppleScript's text item delimiters to oTIDs
return L
end decoupe
--=====
on recolle(L, d)
local oTIDs, t
set oTIDs to AppleScript's text item delimiters
set AppleScript's text item delimiters to d
set t to L as text
set AppleScript's text item delimiters to oTIDs
return t
end recolle
--=====
(*
Handler borrowed to Regulus6633 - http://macscripter.net/viewtopic.php?id=36861
*)
on writeTo(targetFile, theData, dataType, apendData)
-- targetFile is the path to the file you want to write
-- theData is the data you want in the file.
-- dataType is the data type of theData and it can be text, list, record etc.
-- apendData is true to append theData to the end of the current contents of the file or false to overwrite it
try
set targetFile to targetFile as text
set openFile to open for accessfiletargetFile with write permission
if apendData is false then set eof of openFile to 0
writetheDatatoopenFilestarting ateofasdataType
close accessopenFile
return true
on error
try
close accessfiletargetFile
end try
return false
end try
end writeTo
--=====
on get_iWorkNum(a)
local verNum
tell application a to set verNum to item 1 of my decoupe(get version, ".")
if (a is "Numbers" and verNum is "2") or (a is "Pages" and verNum is "4") then
return "09"
else
return "11"
end if
end get_iWorkNum
--=====
(*
Useful to get function’s localized name if we need to build formulas
examples:
set OFFSET_loc to my getLocalizedTabularString("Numbers", "OFFSET")
set ADDRESS_loc to my getLocalizedTabularString(theApp, "ADDRESS")
set INDIRECT_loc to my getLocalizedTabularString(theApp, "INDIRECT")
Requires :
decoupe()
get_iWorkNum()
getLocalizedName()
*)
on getLocalizedTabularString(theApp, x)
local path2app, p2bndl
tell applicationtheApp to activate
tell application "System Events"
set path2app to (application file of application processtheApp as text)
if exists folder (path2app & "Contents:Frameworks:") then
set p2bndl to path2app & "Contents:Frameworks:SFTabular.framework:Versions:A:Resources:"
else
set p2bndl to (path to application support as text) & "iWork '" & my get_iWorkNum(theApp) & ":Frameworks:SFTabular.framework:Versions:A:Resources:"
end if
return my getLocalizedName(theApp, x, p2bndl)
end tell
end getLocalizedTabularString
--=====
on getLocalizedName(a, x, f)
tell application a to return localized string x from table "Localizable" in bundle file f
end getLocalizedName
--=====
(*
Set the parameter delimiter which must be used in Numbers formulas
*)
on getLocalizedDelimiter()
if character 2 of (0.5 as text) is "." then
return ","
else
return ";"
end if
end getLocalizedDelimiter
--=====
(*
my selectMenu("Pages",5, 12)
==== Uses GUIscripting ====
*)
on selectmenu(theApp, mt, mi)
tell applicationtheApp
activate
tell application "System Events" to tell process theApp to tell menu bar 1 to ¬
tell menu bar itemmt to tell menu 1 to clickmenu itemmi
end tell -- application theApp
end selectmenu
--=====
(*
my selectSubMenu("Pages",6, 4, 26)
==== Uses GUIscripting ====
*)
on selectSubMenu(theApp, mt, mi, ms)
tell applicationtheApp
activate
tell application "System Events" to tell process theApp to tell menu bar 1 to ¬
tell menu bar item mt to tell menu 1 to tell menu item mi to tell menu 1 to click menu item ms
end tell -- application theApp
end selectSubMenu
--=====
--[/SCRIPT]
--{code}
Yvan KOENIG (VALLAURIS, France) mercredi 14 décembre 2011 21:24:34
iMac 21”5, i7, 2.8 GHz, 12 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.2
My iDisk is : <http://public.me.com/koenigyvan>
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