Configuring preferences and options in Outlook.com
Hi, I'm John! I will help you with this.
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After freeing space (or purchasing additional storage), it can take up to 24 to 48 hours for everything to fully update across your account. I’d recommend waiting that time and then trying again to send your emails.
Have you already waited at least 24 hours since clearing the space, or was this done very recently?
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Regards,
John J.D.