diff --git a/dev/Stores/User/Contact.js b/dev/Stores/User/Contact.js
index 1b171bdd6..f9db211ae 100644
--- a/dev/Stores/User/Contact.js
+++ b/dev/Stores/User/Contact.js
@@ -28,10 +28,19 @@ ContactUserStore.sync = fResultFunc => {
 	 && !ContactUserStore.syncing()
 	) {
 		ContactUserStore.syncing(true);
-		Remote.request('ContactsSync', (iError, oData) => {
-			ContactUserStore.syncing(false);
-			fResultFunc && fResultFunc(iError, oData);
-		}, null, 200000);
+		Remote.streamPerLine(line => {
+			try {
+				line = JSON.parse(line);
+				if ('ContactsSync' === line.Action) {
+					ContactUserStore.syncing(false);
+					fResultFunc && fResultFunc(line.ErrorCode, line);
+				}
+			} catch (e) {
+				ContactUserStore.syncing(false);
+				console.error(e);
+				fResultFunc && fResultFunc(Notification.UnknownError);
+			}
+		}, 'ContactsSync');
 	}
 };
 
diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Contacts.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Contacts.php
index fafd4144b..977a49d83 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Contacts.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Contacts.php
@@ -34,7 +34,13 @@ trait Contacts
 	{
 		$oAccount = $this->getAccountFromToken();
 		$oAddressBookProvider = $this->AddressBookProvider($oAccount);
-		if (!$oAddressBookProvider || !$oAddressBookProvider->Sync()) {
+		if (!$oAddressBookProvider) {
+			throw new \RainLoop\Exceptions\ClientException(\RainLoop\Notifications::ContactsSyncError);
+		}
+		\ignore_user_abort(true);
+		\SnappyMail\HTTP\Stream::start(/*$binary = false*/);
+		\SnappyMail\HTTP\Stream::JSON(['messsage'=>'start']);
+		if (!$oAddressBookProvider->Sync()) {
 			throw new \RainLoop\Exceptions\ClientException(\RainLoop\Notifications::ContactsSyncError);
 		}
 		return $this->TrueResponse(__FUNCTION__);
diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
index 27ab534ec..e76d76a7b 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
@@ -172,6 +172,7 @@ class PdoAddressBook
 			{
 				if ($aData['deleted'] && isset($aRemoteSyncData[$sKey], $aRemoteSyncData[$sKey]['vcf']))
 				{
+					\SnappyMail\HTTP\Stream::JSON(['messsage'=>"Delete remote {$sKey}"]);
 					$this->davClientRequest($oClient, 'DELETE', $sPath.$aRemoteSyncData[$sKey]['vcf']);
 				}
 			}
@@ -188,6 +189,7 @@ class PdoAddressBook
 		}
 		if (\count($aIdsForDeletedion))
 		{
+			\SnappyMail\HTTP\Stream::JSON(['messsage'=>'Delete local ' . \implode(', ', $aIdsForDeletedion)]);
 			$this->DeleteContacts($aIdsForDeletedion, false);
 		}
 
@@ -205,6 +207,7 @@ class PdoAddressBook
 				)
 			)
 			{
+				\SnappyMail\HTTP\Stream::JSON(['messsage'=>"Update remote {$sKey}"]);
 				$mID = $aData['id_contact'];
 				$oContact = $this->GetContactByID($mID);
 				if ($oContact)
@@ -254,6 +257,7 @@ class PdoAddressBook
 					$aDatabaseSyncData[$sKey]['changed'] < $aData['changed'])
 			)
 			{
+				\SnappyMail\HTTP\Stream::JSON(['messsage'=>"Update local {$sKey}"]);
 				$mExsistenContactID = isset($aDatabaseSyncData[$sKey]['id_contact']) ?
 					$aDatabaseSyncData[$sKey]['id_contact'] : '';