PATCH WATCH By Susan Bradley Vendors track issues using the Common Vulnerabilities and Exposures (CVE) database. Maintenance of the database is handle
[See the full post at: Understanding CVE]
Susan Bradley Patch Lady/Prudent patcher
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Tags: CISA CVE CVE-2025-21309 Documentation Newsletters outlook Outlook (classic) Outlook (new) Patch Lady Posts windows mail
PATCH WATCH By Susan Bradley Vendors track issues using the Common Vulnerabilities and Exposures (CVE) database. Maintenance of the database is handle
[See the full post at: Understanding CVE]
Susan Bradley Patch Lady/Prudent patcher
Blocking new outlook
Here’s the good news.
What’s the advantage of blocking new Outlook and leaving Windows 10 or Windows 11 without any built-in program to handle emails and calendars?
New Outlook is for everyone. Now everyone with Windows gets the best of Outlook built into Windows for free. No subscription needed.
I believe there is an error in the registry key you used in this article to prevent the installation of Outlook (new) in Windows 10. The value of the UScheduler_Oobe key is not “[\”MS_OUTLOOK\”]”. According to Microsoft the value is [“MS_Outlook”]. The link to the Microsoft post is here.
Use the links here
https://www.askwoody.com/forums/topic/7000002-blocking-new-outlook-from-installing/
It’s WAY eaiser.
Susan Bradley Patch Lady/Prudent patcher
I’m not asking for links on how to do this. I’m alerting you to the text in this article that doesn’t reference a batch file or other means of adding the registry key (which your links do). In this current article you say:
Here’s the good news. If you put the following registry key in place ahead of time, Outlook (new) will not install automatically and will respect the block.
If you are currently using Outlook (classic) and don’t block the installation, Outlook (new) will install, but will not automatically replace, your existing Outlook application.
Simply put in the following registry key ahead of time:
For those people who can create the registry key on their own without using the tools referenced in your links, isn’t the value of “[\”MS_OUTLOOK\”]” incorrect? Shouldn’t it be [“MS_Outlook”] if you’re creating the key “from scratch” without the help of the tools referenced in the links you provided?
For those people who can create the registry key on their own without using the tools referenced in your links…
In addition to a .reg file’s content the post also clearly displays what a user would see in the registry editor. That seems clear enough to me and I would hope that someone comfortable enough to edit the registry directly would understand the difference.
In addition to a .reg file’s content the post also clearly displays what a user would see in the registry editor.
At the link that says, “If you would rather download the registry key and apply it, take a look at …”?
I just realized that you were using the command line Registry Editor. I always use the GUI Registry Editor and that’s what I was considering when I wrote my comment. You are absolutely correct that if the command line Registry Editor is being used that [“\MS_OUTLOOK\”] is correct. Sorry for the confusion.
I use MS Office 2016, which includes its own version of Outlook. That version appears to be completely separate from Outlook (new), which is also installed. Under what circumstances would Outlook (new) replace or interfere with my Outlook 2016?
(Sorry if this is not posted in the right place. If that is the case, please tell me where to post it.)
I’m using Outlook (classic) in Win10 by way of Microsoft 365 Apps for Business. After reading this, I checked and see Outlook (new) in the Start > Apps list now, though I have not launched it.
Given Susan’s statement in the article, “If you put the following registry key in place ahead of time, Outlook (new) will not install automatically and will respect the block.“, will running an uninstall from the Start > Apps list remove it enough to have the cited regedit entries work since the change would not be “ahead of time” anymore?
FWIW, the MS 365 Apps version listed in appwiz.cpl is 16.0.18324.20194, installed four days ago.
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