Commands › Exchange Online

Set-MailboxSpellingConfiguration

Exchange Online ExchangeOnlineManagement Set-*

Modify Outlook on the web spelling checker options for a specified user. For example, you can set the dictionary language and configure the spelling checker to ignore mixed digits or words in all uppercase.

Quick start script

# Set-MailboxSpellingConfiguration — quick start (serv365.ai)
# 1. Connect (app-only shown; interactive: omit the certificate parameters)
Connect-ExchangeOnline -CertificateThumbprint $thumb -AppId $appId -Organization $org

# 2. Capture the current state first — you cannot roll back what you never recorded
$before = Get-MailboxSpellingConfiguration
$before | Format-List

# 3. Make the change (dry run first)
Set-MailboxSpellingConfiguration -Identity <MailboxIdParameter> -WhatIf
Set-MailboxSpellingConfiguration -Identity <MailboxIdParameter>

# 4. Verify and diff
$after = Get-MailboxSpellingConfiguration
Compare-Object ($before | Out-String) ($after | Out-String)

Syntax

Set-MailboxSpellingConfiguration [-Identity] <MailboxIdParameter>
 [-CheckBeforeSend <Boolean>]
 [-Confirm]
 [-DictionaryLanguage <SpellCheckerSupportedLanguage>]
 [-DomainController <Fqdn>]
 [-IgnoreMixedDigits <Boolean>]
 [-IgnoreUppercase <Boolean>]
 [-WhatIf]
 [<CommonParameters>]

Parameters (8)

Parameter	Type	Required	What it controls
-Identity	MailboxIdParameter	yes	The Identity parameter specifies the mailbox that you want to modify. You can use any value that uniquely identifies the mailbox. For example:
-CheckBeforeSend	Boolean		The CheckBeforeSend parameter specifies whether Outlook on the web checks the spelling for every message when the user clicks Send in the new message form. Valid values are$true or $false. The default value is $false.
-Confirm	SwitchParameter		The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on whether the cmdlet requires confirmation before proceeding.
-DictionaryLanguage	SpellCheckerSupportedLanguage		The DictionaryLanguage parameter specifies the dictionary language to use when the spelling checker checks the spelling in messages. Valid values are:
-DomainController	Fqdn		This parameter is available only in on-premises Exchange.
-IgnoreMixedDigits	Boolean		The IgnoreMixedDigits parameter specifies whether the spelling checker ignores words that contain numbers. Valid values are $true or $false. The default value is $false.
-IgnoreUppercase	Boolean		The IgnoreUppercase parameter specifies whether the spelling checker ignores words that contain only uppercase letters, for example, acronyms.
-WhatIf	SwitchParameter		The WhatIf switch shows what the command does without making any changes. You don't need to specify a value with this switch.

Reference facts derived from Microsoft documentation, © Microsoft, licensed CC BY 4.0; restructured with original guidance by serv365.ai.