Set-MailboxActiveSync

Exchange Online: Enables or disables ActiveSync for a mailbox

Script

#Requires -Version 5.1

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $true)]
    [string]$MailboxId,
    [bool]$Activate
)

Process {
    try {
        $box = Get-CASMailbox -Identity $MailboxId -ErrorAction Stop
        if ($null -eq $box) {
            throw "Mailbox not found"
        }
        $null = Set-CASMailbox -Identity $MailboxId -ActiveSyncEnabled $Activate -ErrorAction Stop
        $result = Get-CASMailbox -Identity $MailboxId -ErrorAction Stop | Select-Object ActiveSyncEnabled, PrimarySmtpAddress, DisplayName
        $result | ForEach-Object {
            $_ | Add-Member -NotePropertyName Timestamp -NotePropertyValue (Get-Date -Format "yyyy-MM-dd HH:mm:ss") -PassThru -Force
        }
    }
    catch { throw }
}

Customize

MailboxId string

Alias, Display name, Distinguished name, SamAccountName, Guid or user principal name of the mailbox

Activate bool

Enable or disable Exchange ActiveSync for the mailbox