diff --git a/UI/MailerUI/English.lproj/Localizable.strings b/UI/MailerUI/English.lproj/Localizable.strings
index 15ea7e9be4..821736d3d8 100644
--- a/UI/MailerUI/English.lproj/Localizable.strings
+++ b/UI/MailerUI/English.lproj/Localizable.strings
@@ -166,6 +166,9 @@
 "Mark Read"   = "Mark Read";
 "Untitled" = "Untitled";
 
+/* Filter option in messages list */
+"Show unread messages only" = "Show unread messages only";
+
 /* Tree */
 "SentFolderName"   = "Sent";
 "TrashFolderName"  = "Trash";
diff --git a/UI/MailerUI/UIxMailListActions.m b/UI/MailerUI/UIxMailListActions.m
index 6a9e766c4c..22d44c35f1 100644
--- a/UI/MailerUI/UIxMailListActions.m
+++ b/UI/MailerUI/UIxMailListActions.m
@@ -421,29 +421,30 @@ - (NSString *) imap4SortOrdering
 
 - (EOQualifier *) searchQualifier
 {
-  EOQualifier *qualifier, *searchQualifier;
+  EOQualifier *qualifier, *notDeleted, *searchQualifier;
   WORequest *request;
   NSDictionary *sortingAttributes, *content, *filter;
   NSArray *filters;
   NSString *searchBy, *searchInput, *searchString, *match;
-  NSMutableArray *searchArray;
+  NSMutableArray *qualifiers, *searchArray;
+  BOOL unseenOnly;
   int nbFilters, i;
   
   request = [context request];
   content = [[request contentAsString] objectFromJSONString];
+  notDeleted = [EOQualifier qualifierWithQualifierFormat: @"(not (flags = %@))", @"deleted"];
   qualifier = nil;
+  qualifiers = [NSMutableArray arrayWithObject: notDeleted];
   searchString = nil;
   match = nil;
   filters = [content objectForKey: @"filters"];
+  unseenOnly = [[content objectForKey: @"unseenOnly"] boolValue];
 
   if (filters)
     {
       nbFilters = [filters count];
       if (nbFilters > 0) {
         searchArray = [NSMutableArray arrayWithCapacity: nbFilters];
-        sortingAttributes = [content objectForKey: @"sortingAttributes"];
-        if (sortingAttributes)
-          match = [sortingAttributes objectForKey: @"match"]; // AND, OR
         for (i = 0; i < nbFilters; i++)
           {
             filter = [filters objectAtIndex:i];
@@ -465,36 +466,42 @@ - (EOQualifier *) searchQualifier
                 [self errorWithFormat: @"Missing parameters in search filter: %@", filter];
               }
           }
+        sortingAttributes = [content objectForKey: @"sortingAttributes"];
+        if (sortingAttributes)
+          match = [sortingAttributes objectForKey: @"match"]; // AND, OR
         if ([match isEqualToString: @"OR"])
           qualifier = [[EOOrQualifier alloc] initWithQualifierArray: searchArray];
         else
           qualifier = [[EOAndQualifier alloc] initWithQualifierArray: searchArray];
+        [qualifier autorelease];
+        [qualifiers addObject: qualifier];
       }
     }
-    
+
+  if (unseenOnly)
+    {
+      searchQualifier = [EOQualifier qualifierWithQualifierFormat: @"(not (flags = %@))", @"seen"];
+      [qualifiers addObject: searchQualifier];
+    }
+
+  if ([qualifiers count] > 1)
+    {
+      qualifier = [[EOAndQualifier alloc] initWithQualifierArray: qualifiers];
+      [qualifier autorelease];
+    }
+  else
+    qualifier = notDeleted;
+
   return qualifier;
 }
 
 - (NSArray *) getSortedUIDsInFolder: (SOGoMailFolder *) mailFolder
 {
-  EOQualifier *qualifier, *fetchQualifier, *notDeleted;
-
   if (!sortedUIDs)
     {
-      notDeleted = [EOQualifier qualifierWithQualifierFormat: @"(not (flags = %@))", @"deleted"];
-      qualifier = [self searchQualifier];
-      if (qualifier)
-        {
-          fetchQualifier = [[EOAndQualifier alloc] initWithQualifiers: notDeleted, qualifier, nil];
-          [fetchQualifier autorelease];
-        }
-      else
-        fetchQualifier = notDeleted;
-
-      sortedUIDs = [mailFolder fetchUIDsMatchingQualifier: fetchQualifier
+      sortedUIDs = [mailFolder fetchUIDsMatchingQualifier: [self searchQualifier]
                                              sortOrdering: [self imap4SortOrdering]
                                                  threaded: sortByThread];
-    
       [sortedUIDs retain];
     }
 
@@ -737,6 +744,7 @@ - (NSDictionary *) getUIDsInFolder: (SOGoMailFolder *) folder
  * @apiParam {String} filters.searchBy                       Field criteria. Either subject, from, to, cc, or body.
  * @apiParam {String} filters.searchInput                    String to match.
  * @apiParam {String} [filters.negative]                     Reverse the condition when true. Defaults to false.
+ * @apiParam {Boolean} [unseenOnly]                          Filter out seen messages when true. Defaults to false.
  *
  * @apiSuccess (Success 200) {Number} threaded               1 if threading is enabled for the user.
  * @apiSuccess (Success 200) {Number} unseenCount            Number of unread messages
diff --git a/UI/Templates/MailerUI/UIxMailFolderTemplate.wox b/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
index 5dad98db23..324d8f9038 100644
--- a/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
+++ b/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
@@ -73,6 +73,10 @@
         </md-button>
         <a href="#" class="sg-folder-name"
            ng-click="mailbox.searchMode($event)" ng-bind="mailbox.service.selectedFolder.$displayName"><!-- mailbox name --></a>
+        <md-button class="sg-icon-button" label:aria-label="Show unread messages only"
+                   ng-click="mailbox.selectedFolder.toggleUnseenOnly()">
+          <md-icon class="md-default-theme md-fg md-primary" ng-class="{ 'md-hue-2': mailbox.selectedFolder.$unseenOnly }" >mark_as_unread</md-icon>
+        </md-button>
         <md-menu>
           <md-button class="sg-icon-button" label:aria-label="Sort"
                      ng-click="$mdMenu.open()">
diff --git a/UI/WebServerResources/js/Mailer/Mailbox.service.js b/UI/WebServerResources/js/Mailer/Mailbox.service.js
index 209a2a1ea5..6aacacd655 100644
--- a/UI/WebServerResources/js/Mailer/Mailbox.service.js
+++ b/UI/WebServerResources/js/Mailer/Mailbox.service.js
@@ -342,6 +342,17 @@
     return angular.isDefined(this.$selectedMessage);
   };
 
+  /**
+   * @function toggleUnseenOnly
+   * @memberof Mailbox.prototype
+   * @desc Toggle filter by unseen messages only. Requires a round trip to the server.
+   */
+  Mailbox.prototype.toggleUnseenOnly = function() {
+    var _this = this;
+    this.$unseenOnly = !this.$unseenOnly;
+    this.$filter(Mailbox.$query);
+  };
+
   /**
    * @function $filter
    * @memberof Mailbox.prototype
@@ -394,6 +405,9 @@
       options.syncToken = this.$syncToken;
     }
 
+    if (this.$unseenOnly)
+      options.unseenOnly = 1;
+
     // Restart the refresh timer, if needed
     if (!Mailbox.$virtualMode) {
       var refreshViewCheck = Mailbox.$Preferences.defaults.SOGoRefreshViewCheck;