Mitel Build and Microsoft Server
Update Compatibility List

Use this list to determine which Microsoft Windows Server Updates are compatible with the Mitel build you are using.

It is important that you do not upgrade your Windows Server unless they have been marked as compatible with the Mitel build you are using.

If you are uncertain, please submit a support ticket through the online support portal and we can assist.

If you are in need of a Mitel support partner, please contact us.

Note: Do not install Windows updates KB5036896 and KB5036899 If you have already installed these updates remove them immediately as they make it so some services cannot be started.

Mitel Release	Mitel PBX Build	Compatible with the latest Microsoft Server updates published on or before the following dates:

Release 20.0	22.28.9700.0	8/23/2024
Release 19.3 - SP3	22.24.7100.0	8/16/2023
Release 19.3 - SP2	22.24.1500.0	12/19/2022
Release 19.3 - SP1	22.23.5600.0	9/23/2022
Release 19.3	22.22.6100.0	6/25/2022
Release 19.2 - SP3	22.20.2300.0	12/15/2021
Release 19.2 - SP2	22.20.1300.0	11/08/2021
Release 19.2 - SP1	22.18.4000.0	6/14/2021
Release 19.2	22.13.4800.0	11/2020
Release 19.1 - SP2	22.11.9300.0	4/2020
Release 19.1 - SP1	22.11.4900.0	2/2020
Release 19.1	22.10.7600.0	9/2019
R1807 – Onsite - SP2	21.90.9743.0	7/2019
R1807 – Onsite - SP1	21.90.9738.0	2/2019
R1807 - Onsite	21.90.4127.0	10/2018
R1804 – Onsite - SP1	21.88.3753.0	9/2018
R1804 - Onsite	21.88.3731.0	6/2018
R1803 - Onsite	21.87.9727.0	5/2018
R1801 - Onsite*	21.87.3629.0	2/2018
R1711 - Onsite	21.86.1828.0	1/2018
R1707 - Onsite - SP2	21.84.5543.0	12/2017
R1707 - Onsite - SP1	21.84.5535.0	10/2017
R1707 - Onsite	21.84.5523.0	9/2017
R1704 - Onsite - SP2	21.82.9645.0	8/2017
R1704 - Onsite - SP1	21.82.9630.0	7/2017
R1704 - Onsite	21.82.9623.0	6/2017