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Exchange Team Blog
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Released: September 2025 Exchange Server Hotfix Updates

The_Exchange_Team's avatar
The_Exchange_Team
Platinum Contributor
Sep 08, 2025
Microsoft has released Hotfix Updates (HUs) that address issues in earlier updates for: Exchange Server Subscription Edition (SE) Exchange Server 2019 Exchange Server 2016 HUs are availab...
Updated Sep 08, 2025
Version 1.0
administration
announcements
exchange 2016
exchange 2019
exchange se
on premises
setup
LukasSMSFT's avatar
LukasSMSFT
Icon for Microsoft rankMicrosoft
Sep 08, 2025

That’s correct.

Tonibert's avatar
Tonibert
Brass Contributor
Sep 09, 2025

Hello Lukas,

the information that pure on-premises installations do not need to install the update would probably be worth including in the FAQ. :-)

  • PS_Exchange_Adm's avatar
    PS_Exchange_Adm
    Copper Contributor
    Sep 09, 2025

    I would amend the statement to say any pure on-premise environments with no intention to set up a hybrid environment with Exchange Online do not need to install this update.  Likewise, any environment where all mailboxes are in the cloud but maintain an on-premise Exchange server for recipient management can probably skip this update as well.