diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
index ad02c6a1296..cae77bb3d29 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -79,8 +79,6 @@ highPriority=High
 mediumPriority=Medium
 lowPriority=Low
 
-noEventsToSave=No events selected to save.
-
 importPrompt=Which calendar do you want to import these items into?
 exportPrompt=Which calendar do you want to export from?
 publishPrompt=Which calendar do you want to publish?
@@ -143,47 +141,15 @@ New=New
 Open=Open
 filepickerTitleImport=Import
 filepickerTitleExport=Export
-filepickerDefString=MozillaCalendarFile.ics
 
 # Filters for export/import/open file picker.  %1$S will be replaced with
 # wildmat used to filter files by extension, such as (*.html; *.htm).
 filterIcs=iCalendar (%1$S)
-filterVcs=vCalendar 1.0 (%1$S)
-filterXcs=iCalendar XML Document (%1$S)
 filterXml=XML Document (%1$S)
-filterRtf=Rich Text Format (%1$S)
 filterHtml=Web Page (%1$S)
-filterCsv=Comma Separated Values (%1$S)
 filterOutlookCsv=Outlook Comma Separated Values (%1$S)
-filterRdf=iCalendar RDF (%1$S)
 filterWav=Waveform Audio (%1$S)
 
-# Literal Outlook CSV headers.  Take from a .csv file exported by Outlook.
-# For matching first line of .csv file to import Outlook Comma Separated events.
-outlookCSVTitle      =Subject
-outlookCSVStartDate  =Start Date
-outlookCSVStartTime  =Start Time
-outlookCSVEndDate    =End Date
-outlookCSVEndTime    =End Time
-outlookCSVAllDayEvent=All day event
-outlookCSVAlarm      =Reminder on/off
-outlookCSVAlarmDate  =Reminder Date
-outlookCSVAlarmTime  =Reminder Time
-outlookCSVCategories =Categories
-outlookCSVDescription=Description
-outlookCSVLocation   =Location
-outlookCSVPrivate    =Private
-# Literal values for True and False in .csv files exported by Outlook
-outlookCSVValueTrue  =True
-outlookCSVValueFalse =False
-
-# Questions to user about how to parse values
-outlookCSVDateParseConfirm=\
-  A date in this file is formatted as "%1$S".\n\
-  The operating system is set to parse this date as "%2$S".\n\
-  Is this OK?\n\
-  (If not, adjust settings so format matches, then restart this application.)
-
 # Remote calendar errors
 errorTitle=Error getting calendar
 httpPutError=Publishing the calendar file failed.\nStatus code: %1$S: %2$S
@@ -203,7 +169,6 @@ proceedModify=Submit my changes anyway
 proceedDelete=Delete anyway
 dav_notDav=The resource at %1$S is either not a DAV collection or not available
 dav_davNotCaldav=The resource at %1$S is a DAV collection but not a CalDAV calendar
-dav_noProps=Unable to get properties of resource %1$S (not a network resource?)
 itemPutError=There was an error storing the item on the server.
 itemDeleteError=There was an error deleting the item from the server.
 
@@ -310,10 +275,7 @@ htmlPrefixLocation=Location
 htmlPrefixDescription=Description
 
 # Categories
-categoryReplace=A category already exists with that name. \n Do you want to replace it?
-categoryReplaceTitle=Warning: Duplicate name
 addCategory=Add Category
-newCategory=New Category…
 
 today=Today
 tomorrow=Tomorrow
@@ -327,10 +289,6 @@ shortcalendarweek=CW
 
 go=Go
 
-# Confirming whether or not to close the new/edit item dialog
-confirmCloseTitle=Discard changes?
-confirmCloseText=Discard changes and close the dialog?
-
 # Some languages have different conjugations of 'next' and 'last'.  If yours
 # does not, simply repeat the value.  This will be used with day names, as in
 # 'next Sunday'.
@@ -356,10 +314,7 @@ updatesItem_pendingFallback=Apply Downloaded Update Now…
 
 # Alarm Dialog
 alarmWindowTitle=%1$S Reminders
-
-alarmDue=Due: %1$S
 alarmStarts=Starts: %1$S
-
 alarmTodayAt=Today at %1$S
 alarmTomorrowAt=Tomorrow at %1$S
 alarmYesterdayAt=Yesterday at %1$S
@@ -375,4 +330,4 @@ taskDetailsStatusCompletedOn=Completed on %1$S
 taskDetailsStatusCancelled=Cancelled
 
 gettingCalendarInfoCommon=Checking Calendars\u2026
-gettingCalendarInfoDetail=Checking Calendar %1$S of %2$S
\ No newline at end of file
+gettingCalendarInfoDetail=Checking Calendar %1$S of %2$S
diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/providers/wcap/wcap.properties b/mozilla/calendar/locales/en-US/chrome/calendar/providers/wcap/wcap.properties
index b0207419cdb..0474ede5358 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/providers/wcap/wcap.properties
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/providers/wcap/wcap.properties
@@ -54,6 +54,3 @@ loginDialog.label=Calendar Server Password Required
 privateItem.title.text=Private
 confidentialItem.title.text=Confidential
 busyItem.title.text=Busy
-
-# Providers
-wcapName=Sun Java System Calendar Server (WCAP)
diff --git a/mozilla/calendar/locales/en-US/chrome/lightning/lightning.properties b/mozilla/calendar/locales/en-US/chrome/lightning/lightning.properties
index 34d00d33401..0b73a3f9b6f 100644
--- a/mozilla/calendar/locales/en-US/chrome/lightning/lightning.properties
+++ b/mozilla/calendar/locales/en-US/chrome/lightning/lightning.properties
@@ -40,12 +40,6 @@
 # Lightning branding
 brandShortName=Lightning
 
-# Lightning specific strings
-
-agendaToday=Today
-agendaTomorrow=Tomorrow
-agendaSoon=Soon
-
 # Html event display in message
 imipHtml.header=Event Invitation
 imipHtml.summary=Title: