CmdID

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Set-MailboxSpellingConfiguration

Use the Set-MailboxSpellingConfiguration cmdlet to modify Outlook on the web spelling checker options for a specified user. Exchange PowerShell reference

From the Exchange PowerShell reference 8 parameters Its page in the reference

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Parameters

8 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox that you want to modify.
-CheckBeforeSendThe CheckBeforeSend parameter specifies whether Outlook on the web checks the spelling for every message when the user clicks Send in the new message form.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DictionaryLanguageThe DictionaryLanguage parameter specifies the dictionary language to use when the spelling checker checks the spelling in messages.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-IgnoreMixedDigitsThe IgnoreMixedDigits parameter specifies whether the spelling checker ignores words that contain numbers.
-IgnoreUppercaseThe IgnoreUppercase parameter specifies whether the spelling checker ignores words that contain only uppercase letters, for example, acronyms.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.