diff --git a/src/com/fsck/k9/preferences/AccountSettings.java b/src/com/fsck/k9/preferences/AccountSettings.java
index 8e691eaf6..89ab53905 100644
--- a/src/com/fsck/k9/preferences/AccountSettings.java
+++ b/src/com/fsck/k9/preferences/AccountSettings.java
@@ -158,8 +158,9 @@ public class AccountSettings {
         return new SettingsDescription(type, defaultValue, validator);
     }
 
-    public static Map<String, String> validate(Map<String, String> importedSettings) {
-        return Settings.validate(SETTINGS, importedSettings);
+    public static Map<String, String> validate(Map<String, String> importedSettings,
+            boolean useDefaultValues) {
+        return Settings.validate(SETTINGS, importedSettings, useDefaultValues);
     }
 
     public static class StorageProviderDefaultValue implements IDefaultValue {
diff --git a/src/com/fsck/k9/preferences/GlobalSettings.java b/src/com/fsck/k9/preferences/GlobalSettings.java
index ba12440dc..8064c67ef 100644
--- a/src/com/fsck/k9/preferences/GlobalSettings.java
+++ b/src/com/fsck/k9/preferences/GlobalSettings.java
@@ -1,8 +1,10 @@
 package com.fsck.k9.preferences;
 
 import java.text.SimpleDateFormat;
+import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import android.content.SharedPreferences;
 import com.fsck.k9.FontSizes;
 import com.fsck.k9.K9;
 import com.fsck.k9.R;
@@ -129,9 +131,21 @@ public class GlobalSettings {
     }
 
     public static Map<String, String> validate(Map<String, String> importedSettings) {
-        return Settings.validate(SETTINGS, importedSettings);
+        return Settings.validate(SETTINGS, importedSettings, false);
     }
 
+    public static Map<String, String> getGlobalSettings(SharedPreferences storage) {
+        Map<String, String> result = new HashMap<String, String>();
+        for (String key : SETTINGS.keySet()) {
+            String value = storage.getString(key, null);
+            if (value != null) {
+                result.put(key, value);
+            }
+        }
+        return result;
+    }
+
+
     public static class GalleryBugWorkaroundDefaultValue implements IDefaultValue {
         @Override
         public Object computeDefaultValue(String key, Map<String, String> validatedSettings) {
diff --git a/src/com/fsck/k9/preferences/Settings.java b/src/com/fsck/k9/preferences/Settings.java
index 29b0068b8..c1b763c5f 100644
--- a/src/com/fsck/k9/preferences/Settings.java
+++ b/src/com/fsck/k9/preferences/Settings.java
@@ -28,7 +28,7 @@ public class Settings {
     public static final ISettingValidator SOLID_COLOR_VALIDATOR = new SolidColorValidator();
 
     public static Map<String, String> validate(Map<String, SettingsDescription> settings,
-            Map<String, String> importedSettings) {
+            Map<String, String> importedSettings, boolean useDefaultValues) {
 
         Map<String, String> validatedSettings = new HashMap<String, String>();
         for (Map.Entry<String, SettingsDescription> setting : settings.entrySet()) {
@@ -37,17 +37,19 @@ public class Settings {
 
             boolean useDefaultValue;
             if (!importedSettings.containsKey(key)) {
-                Log.v(K9.LOG_TAG, "Key \"" + key + "\" wasn't found in the imported file. Using default value.");
-                useDefaultValue = true;
+                Log.v(K9.LOG_TAG, "Key \"" + key + "\" wasn't found in the imported file." +
+                        ((useDefaultValues) ? " Using default value." : ""));
+                useDefaultValue = useDefaultValues;
             } else {
                 String importedValue = importedSettings.get(key);
                 if (Settings.isValid(desc, key, importedValue, validatedSettings)) {
                     validatedSettings.put(key, importedValue);
                     useDefaultValue = false;
                 } else {
-                    Log.v(K9.LOG_TAG, "Key \"" + key + "\" has invalid value \"" + importedValue + "\" in " +
-                            "imported file. Using default value.");
-                    useDefaultValue = true;
+                    Log.v(K9.LOG_TAG, "Key \"" + key + "\" has invalid value \"" + importedValue +
+                            "\" in imported file. " +
+                            ((useDefaultValues) ? "Using default value." : "Skipping."));
+                    useDefaultValue = useDefaultValues;
                 }
             }
 
diff --git a/src/com/fsck/k9/preferences/StorageImporter.java b/src/com/fsck/k9/preferences/StorageImporter.java
index 3768a06bb..de97d2da3 100644
--- a/src/com/fsck/k9/preferences/StorageImporter.java
+++ b/src/com/fsck/k9/preferences/StorageImporter.java
@@ -170,7 +170,7 @@ public class StorageImporter {
                 try {
                     SharedPreferences.Editor editor = storage.edit();
                     if (imported.globalSettings != null) {
-                        importGlobalSettings(editor, imported.globalSettings);
+                        importGlobalSettings(storage, editor, imported.globalSettings);
                     } else {
                         Log.w(K9.LOG_TAG, "Was asked to import global settings but none found.");
                     }
@@ -251,12 +251,18 @@ public class StorageImporter {
         }
     }
 
-    private static void importGlobalSettings(SharedPreferences.Editor editor,
-            ImportedSettings settings) {
+    private static void importGlobalSettings(SharedPreferences storage,
+            SharedPreferences.Editor editor, ImportedSettings settings) {
 
-        Map<String, String> writeSettings = GlobalSettings.validate(settings.settings);
+        Map<String, String> validatedSettings = GlobalSettings.validate(settings.settings);
 
-        for (Map.Entry<String, String> setting : writeSettings.entrySet()) {
+        // Use current global settings as base and overwrite with validated settings read from the
+        // import file.
+        Map<String, String> mergedSettings =
+            new HashMap<String, String>(GlobalSettings.getGlobalSettings(storage));
+        mergedSettings.putAll(validatedSettings);
+
+        for (Map.Entry<String, String> setting : mergedSettings.entrySet()) {
             String key = setting.getKey();
             String value = setting.getValue();
             Log.v(K9.LOG_TAG, "Write " + key + "=" + value);
@@ -271,7 +277,7 @@ public class StorageImporter {
 
         // Validate input and ignore malformed values when possible
         Map<String, String> validatedSettings =
-            AccountSettings.validate(account.settings.settings);
+            AccountSettings.validate(account.settings.settings, true);
 
         //TODO: validate account name
         //TODO: validate identity settings