The latest rental versions of Office are tied to the internet, so I suspect that you may not be able to go offline without losing the application entirely. However as I use a stand alone version of Office 2016, and avoid the cloud entirely, I cannot confirm that. What happens if you log out of Office?

Clearly you don't want messages sent immediately so what I use is as follows. I also use MailWasher to monitor all my incoming mail before it hits Outlook.

Tools > Options > Advanced > Send and Receive > Uncheck 'Send immediately when connected'


Tools > Options > Advanced > Send and Receive > Send/Receive > Uncheck both 'Schedule an automatic send/receive' options.
Outlook should not then send or receive automatically whether you are on line or off and will save messages you send to your outbox until you force a send/receive.

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Graham Mayor - MS MVP (Word) (2002-2019)
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I have not tried to log out of Outlook itself because it is part of Microsoft Professional and all programs are together even if each of them are separate in use. But if it is possible I am unsure how to log out of just Outlook and then sign in again.

I did what you suggested:
Tools > Options > Advanced > Send and Receive > Uncheck 'Send immediately when connected'
Tools > Options > Advanced > Send and Receive > Send/Receive > Uncheck both 'Schedule an automatic send/receive' options.

I closed out of Outlook, then opened Outlook back up, clicked send and receive but no mail. That does not mean it didn't work. I might just not have any mail. I will have to give it a day or two to find out. Outlook is my second email account. My first is yahoo.

I want to thank you for your quick reply and help you gave me. I still would like to remove the work offline message because when I first installed this program it was not there.