I have a Outlook.com email account and Outlook 2013 running on a Windows 10 Ent laptop.
Outlook configures the Outlook.com account and downloads the mail in the mailbox.
It will NOT send any mail, any new mail created is stuck in the Outbox. Send/Receive reports every task successful, there are no errors.
I have tried everything up to and including rebuilding Windows on the machine, reinstalling Office etc. So I believe it is the account, but why?
If the outlook.com account is accessed on-line everything works fine.