Disabling the URL Preview in Office 365 email using PowerShell
You can quickly disable the Link Preview in Office 365 for a single user setting the LinkPreviewEnabled attribute to $false when you type:
Get-MailboxMessageConfiguration –identity ebuford –LinkPreviewEnabled $false
You can also do this for All your users if you like by getting all the mailboxes and setting them at once:
get-mailbox | Set-MailboxMessageConfiguration -LinkPreviewEnabled $false