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Topics Map > Communication and Collaboration > Office 365
Topics Map > Communication and Collaboration > Email
Office 365, Email, Outlook, Messages aren't sent and appear in outbox folder
Sent messages in Microsoft Outlook appear in the Outbox folder, instead of the normal sent mail folder. This is accompanied by a message saying that the messages were not sent.
Go to File -> Options, and
then click on the Advanced tab. You should see a check box for "Send immediately when connected." Make sure this is checked. This is
checked by default.
You will also want to check to make sure that Outlook is not in "Work Offline" mode by going to the File menu.