When you use online mode, the deferred messages are submitted to the Exchange message queue and held until the scheduled time as Outlook doesn’t have a local cache when you use online mode, so it can’t hold them at the client. When you use an Microsoft Exchange mailbox (either on-prem or Office 365 Exchange online) you can send messages later, with Outlook closed, as long as you can set the account up in Outlook desktop using Online mode. When you defer sending a message, in either online or cached mode, Outlook will always show the Sent time as the time you pressed Send, not the time Exchange actually sent the message. If you do not have the Send menu in Outlook on the web, it is not supported on your server version.Ĭhoose the date and time (you can type in the time field) then Send. To use it, click the Send menu and select Send Later.
