Solved New Outlook - how to permanently disable it??


Yes, I mean "Mail and Calendar". I know this is deprecated, but I want to use it. :-D Is there any way?
Doubt it as it’s being deprecated and also being removed from Windows automatically. Unless someone else can find a way of keeping the app files on your system I’m afraid you’re stuck. Why not use outlook online or Google Calendar?
 

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    Windows 11 build 10.0.22635.4515 Beta / WSL 2 running Ubuntu
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    Laptop
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    Dell Inspiron 14 5430
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    Intel i7-1355U
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    Dell 0GMW80
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    16GB
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    Intel Iris XE
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    Realtek
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    Dell 14", LG 32" Curved Wide screen monitor and LG Ultrawide 26"
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    Samsung 990 Pro 1TB NVME Gen 4 M.2 SSD
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    Dell
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    Dell KM3322W
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    900mb down / 400mb up FTTP
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    Edge 132.0.2957.11
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    Windows Defender
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    Windows 365
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    Python 3.13
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    Garmin Express
    Dell TB16 Thunderbolt dock
    WSL
    WEI Score: 8.3
  • Operating System
    Windows 11
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    Tablet
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    Microsoft Surface Pro 7
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    Core i5 - 1035G4
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    Microsoft
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    8GB
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    2736 x 1824
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    128GB
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    Microsoft
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    Microsoft Keyboard
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    None
    Mouse
    Microsoft Arc Intellimouse
    Keyboard
    Microsoft Surface Keyboard
    Internet Speed
    900mb / 400mb FTTP
    Browser
    Edge
    Antivirus
    Windows Defender
Doubt it as it’s being deprecated and also being removed from Windows automatically. Unless someone else can find a way of keeping the app files on your system I’m afraid you’re stuck. Why not use outlook online or Google Calendar?
I am using Startallback and WIN10 systray calendar flyout with integration to Mail and Calendar app for quickly access to Calendar. I am using Microsoft 365 and classic Outlook, but I am used to using Mail & Calendar for quickly events adding from systray. All I have synchronized with Outlook calendar.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
I am using Startallback and WIN10 systray calendar flyout with integration to Mail and Calendar app for quickly access to Calendar. I am using Microsoft 365 and classic Outlook, but I am used to using Mail & Calendar for quickly events adding from systray. All I have synchronized with Outlook calendar.
The way you are hanging on to past functionalities is catching up with you.
I wish you the best looking for alternatives.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    ASUSTeK COMPUTER INC. TUF Gaming FX705GM
    CPU
    2.20 gigahertz Intel i7-8750H Hyper-threaded 12 cores
    Motherboard
    ASUSTeK COMPUTER INC. FX705GM 1.0
    Memory
    24428 Megabytes
    Graphics Card(s)
    Intel(R) UHD Graphics 630 / NVIDIA GeForce GTX 1060
    Sound Card
    Intel(R) Display Audio / Realtek(R) Audio
    Monitor(s) Displays
    Integrated Monitor (17.3"vis)
    Screen Resolution
    FHD 1920X1080 16:9
    Hard Drives
    2 SSD SATA/NVM Express 1.3
    WDS500G2B0A-00SM50 500.1 GB
    WDCSDAPNUW-1002 256 GB
    PSU
    19V DC 6.32 A 120 W
    Cooling
    Dual Fans
    Mouse
    MS Bluetooth
    Internet Speed
    Fiber 1GB Cox -us & IGB Orange-fr
    Browser
    Edge Canary- Firefox Nightly-Chrome Dev-Chrome Dev
    Antivirus
    Windows Defender
    Other Info
    VMs of Windows 11 stable/Beta/Dev/Canary
    VM of XeroLinux- Arch based & Debian 13 (Trixie)
  • Operating System
    Windows 11 Insider Canary
    Computer type
    Laptop
    Manufacturer/Model
    ASUS X751BP
    CPU
    AMD Dual Core A6-9220
    Motherboard
    ASUS
    Memory
    8 GB
    Graphics card(s)
    AMD Radeon R5 M420
    Sound Card
    Realtek
    Monitor(s) Displays
    17.3
    Screen Resolution
    1600X900 16:9
    Hard Drives
    1TB 5400RPM
Why can't you just leave it alone and forget about it like I do with other included Windows apps?
Cause they're too busy listening to the "PC experts" opine it's "taking up resources".

I gave up removing default Windows apps a long time ago. If you want to use another email / calendar client, install it and make it the default.
I've never bothered with removing apps native to the OS, but that I don't use. I like you simply leave them alone and use what I like instead... Office (365) Outlook. The installed "Windows" version doesn't get touched.

So yes, the simple answer is just to leave it alone and ignore it. It will only run if you ask it to.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 24H2 (Build 26100.3476)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom built
    CPU
    Intel Core 9 Ultra
    Motherboard
    Gigabyte Aorus Z890 Xtreme AI Top
    Memory
    64G (4x16) DDR5 Corsair RGB Dominator Platinum (6400Mhz)
    Graphics Card(s)
    Radeon (XFX MERC 310) RX 7900XT
    Sound Card
    Onboard (ESS Sabre HiFi using Realtek drivers)
    Monitor(s) Displays
    27-inch Eizo Color Edge - CG2700X
    Screen Resolution
    3840 x 2160
    Hard Drives
    4 Samsung NVM 990 Pro drives: 1 X 1TB (OS) 2X TB, 1 X 1TB.
    PSU
    Seasonic TX-1300 (1300 Watts)
    Case
    Cooler Master H500M
    Cooling
    Corsair Link Titan 280 RX RGB
    Keyboard
    Logitech Craft
    Mouse
    Logitech MX Master 3
    Internet Speed
    1TB Download. 512mb Upload
    Browser
    Microsoft Edge Chromium
    Antivirus
    Windows Security
    Other Info
    System used for gaming, photography, music, school.
  • Operating System
    Windows 11 Pro 23H2 (Build 22631.4391)
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo ThinkPad X1 Carbon (Gen 12)
    CPU
    Intel Core Ultra 7 165U vPro® Processor
    Motherboard
    Vendor
    Memory
    32 GB LPDDR5X-6400MHz (Soldered)
    Graphics card(s)
    Intel Graphics
    Sound Card
    Onboard
    Monitor(s) Displays
    14" 2.8K OLED, Anti Reflection, Touch, HDR 500, 400 nits, 120Hz
    Screen Resolution
    2880 x 1800
    Hard Drives
    1 TB SSD M.2 2280 PCIe Gen4 Performance TLC Opal
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    Vendor
    Case
    Lenovo
    Cooling
    Vapor Chamber Cooling
    Mouse
    Touchpad: Haptic Touchpad
    Keyboard
    Backlit, Black with Fingerprint Reader and WWAN
    Internet Speed
    100MB
    Browser
    Edge Chromium
    Antivirus
    Windows Security
    Other Info
    202. Build Your Own laptop.
    vPro Certified Model: vPro Enterprise
I have tried New Outlook 3 months ago, installed via MS Store, on both Windows 10 and 11 standard latest consumer versions.

Incompatibilities were sent to MS, because it is in Beta, currently no answers back.

A month ago uninstalled on both Windows machines, no problem.

Throughout this Mail & Calendar were used and are still used with 6 Email Accounts, Calendar is synced with one MS Account.

Of course the "Try the new Outlook" slider is still there on both Mail & Calendar. It just stays Off, no problem.

I don't have any system mods.
 

My Computer

System One

  • OS
    Windows 11
Cause they're too busy listening to the "PC experts" opine it's "taking up resources".


I've never bothered with removing apps native to the OS, but that I don't use. I like you simply leave them alone and use what I like instead... Office (365) Outlook. The installed "Windows" version doesn't get touched.

So yes, the simple answer is just to leave it alone and ignore it. It will only run if you ask it to.
Just like this where the user wants to remove stuff. Then later on, they'll be wondering why they're having problems. They'll probably blame Microsoft.

 

My Computers

System One System Two

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    Stigg's Build
    CPU
    Intel Core i9-10900X
    Motherboard
    GIGABYTE X299X DESIGNARE 10G
    Memory
    Corsair 64 GB (4 x 16 GB) CMW64GX4M4C3000C15 Vengeance RGB Pro 3000Mhz DDR4
    Graphics Card(s)
    GIGABYTE GeForce GTX 1660 Super Mini ITX 6 GB OC
    Sound Card
    Realtek ALC1220
    Monitor(s) Displays
    Samsung 27" FHD LED FreeSync Gaming Monitor (LS27F350FHEXXY)
    Screen Resolution
    1920 x 1080
    Hard Drives
    Samsung 970 Pro Series 1TB M.2 2280 NVMe SSD
    Western Digital Red Pro WD8003FFBX-68B9AN0 8 TB, 7200 RPM, SATA-III
    Western Digital Red Pro WD8003FFBX-68B9AN0 8 TB, 7200 RPM, SATA-III
    PSU
    Corsair HX1200 1200W 80 Plus Platinum
    Case
    Fractal Design Define 7 Black Solid Case
    Cooling
    Noctua NH-D15 Chromax Black
    Keyboard
    Razer Ornata V2
    Mouse
    Razer DeathAdder Essential
    Internet Speed
    FTTN 100Mbps / 40Mbps
    Browser
    Mozilla Firefox
    Antivirus
    N/A
    Other Info
    Logitech BRIO 4k Ultra HD USB-C Webcam
  • Operating System
    Windows 10 Pro
    Computer type
    Laptop
    Manufacturer/Model
    ASUS ROG Zephyrus M GM501GS
    CPU
    Core i7-8750H
    Motherboard
    Zephyrus M GM501GS
    Memory
    SK Hynix 32 GB (2 x 16 GB) HMA82GS6CJR8N-VK 16 GB DDR4-2666 DDR4 SDRAM
    Graphics card(s)
    NVIDIA GeForce GTX 1070
    Sound Card
    Realtek ALC294
    Monitor(s) Displays
    AU Optronics B156HAN07.1 [15.6" LCD]
    Screen Resolution
    1920 x 1080
    Hard Drives
    Samsung MZVKW512HMJP-00000 512 GB, PCI-E 3.0 x4
    Samsung SSD 860 QVO 4TB 4 TB, SATA-III
    PSU
    N/A
    Case
    N/A
    Cooling
    N/A
    Mouse
    Razer DeathAdder Essential
    Keyboard
    PC/AT Enhanced PS2 Keyboard (101/102-Key)
    Internet Speed
    FTTN 100Mbps / 40Mbps
    Browser
    Mozilla Firefox
    Antivirus
    N/A
    Other Info
    USB2.0 HD UVC Webcam
  1. Run
    Code:
    del %LOCALAPPDATA%\Packages\microsoft.windowscommunicationsapps_8wekyb3d8bbwe\LocalState\Migration\settings.json
  2. Uninstall the new Outlook app.
 

My Computers

System One System Two

  • OS
    11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Asus TUF Gaming F16 (2024)
    CPU
    i7 13650HX
    Memory
    16GB DDR5
    Graphics Card(s)
    GeForce RTX 4060 Mobile
    Sound Card
    Eastern Electric MiniMax DAC Supreme; Emotiva UMC-200; Astell & Kern AK240
    Monitor(s) Displays
    Sony Bravia XR-55X90J
    Screen Resolution
    3840×2160
    Hard Drives
    512GB SSD internal
    37TB external
    PSU
    Li-ion
    Cooling
    2× Arc Flow Fans, 4× exhaust vents, 5× heatpipes
    Keyboard
    Logitech K800
    Mouse
    Logitech G402
    Internet Speed
    20Mbit/s up, 250Mbit/s down
    Browser
    FF
  • Operating System
    11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Medion S15450
    CPU
    i5 1135G7
    Memory
    16GB DDR4
    Graphics card(s)
    Intel Iris Xe
    Sound Card
    Eastern Electric MiniMax DAC Supreme; Emotiva UMC-200; Astell & Kern AK240
    Monitor(s) Displays
    Sony Bravia XR-55X90J
    Screen Resolution
    3840×2160
    Hard Drives
    2TB SSD internal
    37TB external
    PSU
    Li-ion
    Mouse
    Logitech G402
    Keyboard
    Logitech K800
    Internet Speed
    20Mbit/s up, 250Mbit/s down
    Browser
    FF

My Computers

System One System Two

  • OS
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Razer Blade 16
    CPU
    AMD Ryzen AI 9 HX 370
    Motherboard
    Razer
    Memory
    64 GB LPDDR5X 8000 MHz RAM
    Graphics Card(s)
    GeForce RTX 5090 24 GB GDDR7 VRAM
    Sound Card
    Six Speaker System THX Spatial Audio
    Monitor(s) Displays
    AOC Q27G3XMN 27" QHD Mini LED Monitor
    Screen Resolution
    QHD (2560x1440)
    Hard Drives
    WD_BLACK SN850X 4TB+8TB SSD
    PSU
    280W AC Power Adapter
    Cooling
    Noctua NT-H2 + Fujipoly Extreme Thermal Pads + llano RGB Laptop Cooling Pad V12
    Keyboard
    SteelSeries Apex 7 TKL - Mechanical Gaming Keyboard (external)
    Mouse
    Razer Basilisk V3 X HyperSpeed
    Internet Speed
    1 GBPS Down / 330 MBPS Up
    Browser
    Google Chrome
    Antivirus
    Avast Premium Security
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell XPS 15 9500
    CPU
    Intel i7-10875H
    Memory
    Kingston FURY Impact 64 GB 3200 MHz DDR4 RAM
    Graphics card(s)
    nVIDIA GeForce GTX 1650 Ti Max-Q w/ 4 GB GDDR6
    Sound Card
    Realtek
    Monitor(s) Displays
    15.6 UHD+ Touch, InfinityEdge, 500-nits, Anti-Reflecitve
    Screen Resolution
    3840 x 2400
    Hard Drives
    Samsung 990 PRO 2TB + 4TB SSDs
    PSU
    Dell 130W Laptop Charger USB C Type C AC Adapter
    Cooling
    Noctua NT-H2 Thermal Paste on CPU + GPU
    Mouse
    Logitech MX Anywhere 3
    Internet Speed
    1 GBPS Down / 350 MBPS Up
    Browser
    Google Chrome
    Antivirus
    Avast Free Antivirus
@Brink

I just read about this tweak: Windows 10: New Outlook will be installed automatically, but there is a solution - gHacks Tech News

I'm confused though, should I set the value to: ["MS_Outlook"] or "MS_Outlook" or MS_Outlook
Looking at this below from Microsoft, I'd say the value should be ["MS_Outlook"]

 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master 3
    Internet Speed
    1 Gbps Download and 35 Mbps Upload
    Browser
    Google Chrome
    Antivirus
    Microsoft Defender and Malwarebytes Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    CyberPower CP1500PFCLCD
    Galaxy S23 Plus phone
  • Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Surface Laptop 7 Copilot+ PC
    CPU
    Snapdragon X Elite (12 core) 3.42 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Monitor(s) Displays
    15" HDR
    Screen Resolution
    2496 x 1664
    Hard Drives
    1 TB SSD
    Internet Speed
    Wi-Fi 7 and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Windows Defender

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