Category Archives: Outlook

Block Outlook from connecting to 365

By | August 10, 2021

Beginning with Office 2016 Outlook auto-connects to 365 upon opening. This causes users to be prompted for credentials if their account is on-premise. To disable this,  run this in PowerShell as the user: Set-ItemProperty -Path HKCU:\software\Microsoft\Office\16.0\Outlook\AutoDiscover -Name ‘ExcludeExplicitO365Endpoint’ -Value 1 -Type DWord -Force

Outlook “Signatures” button fails

By | November 7, 2018

If the “Signatures” button fails to open the dialogue box for changing your signature, you can take the following steps: Locate: [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0006F03A-0000-0000-C000-000000000046}\LocalServer32] Direct it to outlook.exe This file can be renamed .reg and imported to fix this issue on Office 365: Office365

Exchange Permissions

By | August 16, 2018

You can list all users with Mailbox permissions with this in PowerShell: Get-Mailbox | Get-MailboxPermission | where {$_.user.tostring() -ne “NT AUTHORITY\SELF” -and $_.IsInherited -eq $false} | Select Identity,User | Export-Csv -NoTypeInformation mailboxpermissions.csv