diff --git a/content/u/advent-calendar/12/contents.lr b/content/u/advent-calendar/12/contents.lr
index 341eaaf..0acf4d3 100644
--- a/content/u/advent-calendar/12/contents.lr
+++ b/content/u/advent-calendar/12/contents.lr
@@ -45,7 +45,7 @@ You can order our [Hosted Matrix Chat](https://ungleich.ch/u/products/hosted-mat
 
 * The standard price for Hosted Matrix-S with a VM with 1 Core, 2 GB RAM, 10 GB SSD, 100 GB HDD is one-time 30 CHF for setup, 40 CHF for monthly fee.
 * The price with 10% discount: 36 CHF/month
-* For the whole year you pay 510 CHF instead of 462 CHF. You save 48 CHF.
+* For the whole year you pay 462 CHF instead of 510 CHF. You save 48 CHF.
 * Prices exclude VAT.
 
 ## Migration and further customization
diff --git a/content/u/advent-calendar/mattermost/contents.lr b/content/u/advent-calendar/mattermost/contents.lr
index 94946df..e1b968a 100644
--- a/content/u/advent-calendar/mattermost/contents.lr
+++ b/content/u/advent-calendar/mattermost/contents.lr
@@ -4,11 +4,11 @@ _discoverable: no
 ---
 _hidden: no
 ---
-title: VIIRB MAXI PACK
+title: 10% off: Zero Carbon Chat! 
 ---
-subtitle: So many VIIRBs around here!
+subtitle: Get a year of our Hosted Mattermost with 10% discount.
 ---
-image: /u/image/cards/advent-22.jpg
+image: /u/image/cards/advent-21.jpg
 ---
 header_background_color: #C12107
 ---
@@ -16,26 +16,40 @@ header_text_color: text-light
 ---
 nav_classes: navbar-dark
 ---
-headline1: VIIRB MAXI PACK
+headline1: Surprise 21:
 ---
-headline2: 5 VIIRB
+headline2: 10% off
 ---
-headline3: And 1 Switch
+headline3: Hosted Mattermost Chat
 ---
-content1_image:
+content1_image: /u/image/carbonzero-chat.jpg
 ---
 content1_text:
 
-## It's getting VIIRB here!
+## A year of hosted Mattermost chat with 10% discount 
 
-We love our VIIRBs so much that we now offer the Christmas special
-VIIRB MAXI PACK: 5 VIIRBs for only 250 CHF!
+You can order our [Zero Carbon Chat](https://ungleich.ch/u/products/zero-carbon-chat/) plan for a year with 10% discount. Only available for 10 orders, grab it while you can.
 
-## Ready to rock!
+## About the product
 
-With this pack you can start right away building your own networks,
-test subnetting, teach your children - so many options!
+- Hosted Mattermost
+- Suitable for MacOS, Linux, Windows, and on mobile and tablet. 
+- 1 year subscription
+- Fully scalable 
+- Safe data storage protected by Swiss privacy laws
+- VM is running with 100% renewable energy (hydropower) in our [datacenter](https://datacenterlight.ch) in Glarus, Switzerland.
 
-## How to get it
+## The discount
 
-Click on XX, price is excluding shipping + vat
+* The standard price for Zero Carbon Chat Light with a VM with 1 Core, 2 GB RAM, 10 GB SSD, 100 GB HDD is one-time 30 CHF for setup, 40 CHF for monthly fee.
+* The price with 10% discount: 36 CHF/month
+* For the whole year you pay 462 CHF instead of 510 CHF. You save 48 CHF.
+* Prices exclude VAT.
+
+## How to buy it
+
+You can order from the following link and write us the domain name you want for the chat to support at datacenterlight.ch
+
+Our team will get in touch with you and setup the Mattermost Chat for you, and give you the access.
+
+[Order a Zero Carbon Chat Light for a year with 10% discount](https://datacenterlight.ch/product/mattermost-light-advent/)
\ No newline at end of file