SharePoint 2019 PSconfig stops with error An exception of type System.NullReferenceException was thrown. Additional exception information: Object reference not set to an instance of an object.

SP PSConfig does not like comments in web.config:

 https://docs.microsoft.com/en-us/sharepoint/troubleshoot/administration/nullreferenceexception-for-configuration-wizard 

Install Windows 2019 from USB

 https://www.thomasmaurer.ch/2018/07/create-a-usb-drive-for-windows-server-2019-installation/

# Define Path to the Windows Server 2019 ISO $ISOFile = "C:\Temp\WindowsServer2019.iso"   # Get the USB Drive you want to use, copy the friendly name Get-Disk | Where BusType -eq "USB"   # Get the right USB Drive (You will need to change the FriendlyName) $USBDrive = Get-Disk | Where FriendlyName -eq "Kingston DT Workspace"   # Replace the Friendly Name to clean the USB Drive (THIS WILL REMOVE EVERYTHING) $USBDrive | Clear-Disk -RemoveData -Confirm:$true -PassThru   # Convert Disk to GPT $USBDrive | Set-Disk -PartitionStyle GPT   # Create partition primary and format to FAT32 $Volume = $USBDrive | New-Partition -UseMaximumSize -AssignDriveLetter | Format-Volume -FileSystem FAT32 -NewFileSystemLabel WS2019   # Mount iso $ISOMounted = Mount-DiskImage -ImagePath $ISOFile -StorageType ISO -PassThru   # Driver letter $ISODriveLetter = ($ISOMounted | Get-Volume).DriveLetter   # Copy Files to USB Copy-Item -Path ($ISODriveLetter +":\*") -Destination ($Volume.DriveLetter + ":\") -Recurse   # Dismount ISO Dismount-DiskImage -ImagePath $ISOFile

Microsoft Teams Calling new features

 Yesterday Microsoft announced few new features in Teams:

https://www.microsoft.com/en-us/microsoft-365/blog/2020/12/01/restore-and-maintain-personal-connections-with-new-microsoft-teams-calling-features/

including: Teams SBA, SPAM detection, Ringback, Call recording to OneDrive, 

How to change Windows password in RDP or Citrix remote session

 Start "osk"  - On Screen Keyboard - then press CTRL-ALT and with mouse DEL on the osk.

How to enable online archive in Hybrid Exchange

https://social.technet.microsoft.com/wiki/contents/articles/51966.office-365-hybrid-enabling-in-place-archive-with-powershell.aspx

Sharepoint search error The item could not be indexed successfully because the item failed in the indexing subsystem.

https://docs.microsoft.com/en-us/archive/blogs/sp/clear-sharepoint-config-cache-with-powershell

http://bresleveloper.blogspot.com/2016/01/solved-item-could-not-be-indexed.html

in general

https://docs.microsoft.com/en-us/archive/blogs/sp/
https://blogs.msdn.microsoft.com/sharepoint_strategery/2014/12/04/sp2013-understanding-storage-locations-for-files-gathered-by-the-crawl-component/

is a good Knowledge base to keep in mind!

a tool to check Web site security from Mozilla

https://observatory.mozilla.org/