Later versions of Outlook 365 have an “abbreviated” version of the Permissions tab on its folders (like Calendar) that just shows “Custom” without any detail. To restore the proper useful detail in versions 1903 and later:

HKCU\Software\Microsoft\Office\16.0\Outlook\Options\Calendar\
DWORD: ShowLegacySharingUX
Value: 1

When updating a Windows 7/8 machine to Windows 10, it may fail with a message box that says “Windows (10 or 11) has failed” with only an OK button. Here’s how to resolve this:

1. Create an ISO with the Media Creation Tool.
2. Extract the ISO into a folder (WinRAR will do this.)
3. Right-click on Setup, Run as Administrator
4. On the Install Windows 10 page, click on “Change on how Windows Setup downloads updates” link and select “Not Right Now”
5. Proceed with the upgrade and it should complete successfully.

To permanently block Windows 10 from “automatically” (forcing you to) upgrade to Windows 11:

In Windows 10 Pro:

1. GPEDIT
   Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > Windows Update > Windows Update for Business

2. Edit ‘Select the target Feature Update version’ policy to ‘Enabled’ in the right of the Windows Update for Business folder to edit.
3. Set ‘Which Windows product version would you like to receive feature updates for?’ to WIndows 10
4. Set ‘Target version of Feature updates’ to 21H1 or 21H2 or 22H2 (latest)

In Windows 10 Home: (this REG file can also be used to do the following)

1. REGEDIT
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
2. Add key WindowsUpdate
3. Add new DWORD 32-bit named TargetReleaseVersion and set value to 1
4. Add new String Value named ProductVersion and set value to Windows 10
5. Add new String Value named TargetReleaseVersionInfo and set value to 21H2

This can happen on Windows 7 when TLS hasn’t been updated.

1. Make sure KB3140245 has been installed:
   https://www.catalog.update.microsoft.com/search.aspx?q=kb3140245
   
2. Update the registry:
   https://download.microsoft.com/download/0/6/5/0658B1A7-6D2E-474F-BC2C-D69E5B9E9A68/MicrosoftEasyFix51044.msi

(From: https://support.microsoft.com/en-us/topic/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-winhttp-in-windows-c4bd73d2-31d7-761e-0178-11268bb10392)

During the out-of-the-box setup procedure, stop at the screen where it asks to you select a network and:

1. Press Shift + F10
2. At the cmd window type taskmgr and then enter
3. Expand to more details
4. Find ‘Network Connection Flow’ – right click and choose End task
5. Now go back to Setup and continue to add local account

Here’s a YouTube video that shows this being done:

https://www.youtube.com/watch?v=i3NPilpkC8M

We set up a site in IIS on a Windows Server machine that had been configured with the WSUS/WID role. After the site was up and running, we removed the WSUS/WID role on the server. Thereafter, the IIS site was returning “HTTP Error 500″

Removing the WSUS role on the server removes almost all the files installed by the Windows Update Services but does not undo the changes to the configuration written in the ApplicationHost.config file. The Applicationhost.config file tries to call the .dll installed by the WSUS Server which no longer exists on the system.

From the Applicationhost.config file:

<scheme name=”xpress” doStaticCompression=”false” doDynamicCompression=”true” dll=”C:\Program Files\Update Services\Webservices\suscomp.dll” staticCompressionLevel=”10″ dynamicCompressionLevel=”0″ />

Running the following command will remove all references to the module installed by WSUS.

%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']

When Windows 10 is acting as a host for Remote Desktop, redirected printers may stop working or cause the RDP client to crash (NT.DLL.)

This can happen when the “Easy Print” driver is installed by the host machine despite there being a proper printer driver installed. This unnecessary substitution can be turned off:

HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services

Add DWORD key UseUniversalPrinterDriverFirst and set value to 4

(Values are Enabled = 3, Disabled = 4)

In some cases, the host has to be rebooted for this to take effect.

When attempting to attach to a C$ share with proper credentials, it may be rejected as “access denied.”

Example: \\machine\c$

On the target machine with the desired C$, Add/change this registry key and restart the Server service.

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
 Value: LocalAccountTokenFilterPolicy
 Data: 1 (to disable, 0 enables filtering)
 Type: REG_DWORD (32-bit)

We were seeing this error when trying to open a mapped network drive on a Windows Server (in this case, the drive was mapped to a share on the same server.) The server did not have Exchange installed.

This can happen if the number of dynamic ports available for assignment is too small, and this limit’s default value can be adjusted.

C:\>netsh int ipv4 show dynamicport tcp will display the current pool like this:

Protocol tcp Dynamic Port Range
---------------------------------
Start Port      : 49152
Number of Ports : 16384

This can be enlarged to the maximum with this:

C:\>netsh int ipv4 set dynamicport tcp start=1025 num=64510

Immediately after this, our problem was resolved. No reboot was required.

More information is here:

https://docs.microsoft.com/en-US/troubleshoot/windows-server/networking/default-dynamic-port-range-tcpip-chang

1. Open an elevated command prompt window or PowerShell session
2. Type sconfig and press enter.
3. Select option 5
4. Select “A” for automatically download and install updates, “D” for download only or “M” for Manual updates.