diff --git a/core/start-service.sh b/core/start-service.sh
index 17ccff9..22d35ec 100755
--- a/core/start-service.sh
+++ b/core/start-service.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+ADDITIONAL_KOPANO_PACKAGES=${ADDITIONAL_KOPANO_PACKAGES:-""}
+
 set -eu # unset variables are errors & non-zero return values exit the whole script
 
 if [ ! -e /kopano/$SERVICE_TO_START.py ]
@@ -8,6 +10,13 @@ then
     exit 1
 fi
 
+[ ! -z "$ADDITIONAL_KOPANO_PACKAGES" ] && apt update
+[ ! -z "$ADDITIONAL_KOPANO_PACKAGES" ] && for installpkg in "$ADDITIONAL_KOPANO_PACKAGES"; do
+	if [ $(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c "ok installed") -eq 0 ]; then
+		apt --assume-yes install $installpkg;
+	fi
+done
+
 mkdir -p /kopano/data/attachments /tmp/$SERVICE_TO_START /var/run/kopano
 
 echo "Configure core service '$SERVICE_TO_START'" | ts
diff --git a/docker-compose.yml-example b/docker-compose.yml-example
index 07fc89d..8fba278 100644
--- a/docker-compose.yml-example
+++ b/docker-compose.yml-example
@@ -99,6 +99,7 @@ services:
       - ./data/socket/:/run/kopano
     environment:
       - TZ=Europe/Berlin
+      #- ADDITIONAL_KOPANO_PACKAGES=kopano-webapp-plugin-mattermost
     networks:
       - web
       - kopanonet
@@ -140,6 +141,7 @@ services:
       - KCCONF_LDAP_LDAP_SEARCH_BASE=OU=MyUsers,dc=domain,dc=tld  #change here
       - KCCOMMENT_LDAP_1=!include /usr/share/kopano/ldap.openldap.cfg #delete if you want openldap
       - KCUNCOMMENT_LDAP_1=!include /usr/share/kopano/ldap.active-directory.cfg #delete if you want openldap
+      #- ADDITIONAL_KOPANO_PACKAGES=kopano-migration-imap
     networks:
       - kopanonet
     volumes:
diff --git a/webapp/start.sh b/webapp/start.sh
index 6e4ab94..dcbbb83 100755
--- a/webapp/start.sh
+++ b/webapp/start.sh
@@ -1,11 +1,19 @@
 #!/bin/bash
 
-# define default value for serverhostname and serverport of not passed into container
+# define default value for serverhostname and serverport if not passed into container
 KCCONF_SERVERHOSTNAME=${KCCONF_SERVERHOSTNAME:-127.0.0.1}
 KCCONF_SERVERPORT=${KCCONF_SERVERPORT:-237}
+ADDITIONAL_KOPANO_PACKAGES=${ADDITIONAL_KOPANO_PACKAGES:-""}
 
 set -eu # unset variables are errors & non-zero return values exit the whole script
 
+[ ! -z "$ADDITIONAL_KOPANO_PACKAGES" ] && apt update
+[ ! -z "$ADDITIONAL_KOPANO_PACKAGES" ] && for installpkg in "$ADDITIONAL_KOPANO_PACKAGES"; do
+	if [ $(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c "ok installed") -eq 0 ]; then
+		apt --assume-yes install $installpkg;
+	fi
+done
+
 echo "Ensure directories"
 mkdir -p /run/sessions /tmp/webapp