diff --git a/mail/base/jar.mn b/mail/base/jar.mn
index db108e02dc7e..4ab88b3d11f4 100644
--- a/mail/base/jar.mn
+++ b/mail/base/jar.mn
@@ -87,3 +87,6 @@ US.jar:
 +   locale/US/messenger-region/region.properties     (locale/region.properties)
 +   locale/US/global-region/region.dtd               (locale/region.dtd)
 
+en-win.jar:
++   locale/en-US/messenger-mapi/mapi.properties      (locale/mapi.properties)
++   locale/en-US/messenger-mapi/pref-mailnewsOverlay.dtd (locale/pref-mailnewsOverlay.dtd)
diff --git a/mail/base/locale/mapi.properties b/mail/base/locale/mapi.properties
new file mode 100644
index 000000000000..112d898d8e37
--- /dev/null
+++ b/mail/base/locale/mapi.properties
@@ -0,0 +1,23 @@
+# Mail Integration Dialog
+dialogTitle=%S
+dialogText=Do you want to use %S as the default mail application? 
+checkboxText=Do not display this dialog again
+
+# MAPI Messages
+loginText=Please enter your password for %S:
+loginTextwithName=Please enter your username and password 
+loginTitle=%S
+PasswordTitle=%S
+
+# MAPI Error Messages
+errorMessage=%S could not be set as the default mail application because a registry key could not be updated. Verify with your system administrator that you have write access to your system registry, and then try again.
+errorMessageTitle=%S
+
+# MAPI Security Messages
+mapiBlindSendWarning=Another application is attempting to send mail using your user profile. Are you sure you want to send mail?
+mapiBlindSendDontShowAgain=Warn me whenever other applications try to send mail from me
+
+#Default Mail Display String
+# localization note, %S is the vendor name
+defaultMailDisplayTitle=%S
+
diff --git a/mail/base/locale/pref-mailnewsOverlay.dtd b/mail/base/locale/pref-mailnewsOverlay.dtd
new file mode 100644
index 000000000000..d65d92d5dbc7
--- /dev/null
+++ b/mail/base/locale/pref-mailnewsOverlay.dtd
@@ -0,0 +1,3 @@
+<!ENTITY enableMapiTitle.label        "When sending mail from other applications">
+<!ENTITY enableMapi.label             "Use &vendorShortName; as the default mail application">
+<!ENTITY enableMapi.accesskey         "u">