If you dont want to send the message, delete it from the outbox instead of removing the attachment.

Either click the Stop Sync button in the lower left or the little x at the right of the entry to stop the send and receive.

The Outbox should now be visible in message list and you can remove the attachments or delete the message.

She also created video training CDs and online training classes for Microsoft Outlook.

You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

Suddenly, there is my Outbox near bottom left hand side above Mail, Calendar, Contacts etc.

Obviously, one of them was not valid so Outlook for MAC 2011 gave me an error message.

However, now I cannot see the message anymore and no interrupting during sending or shift and restart will make it reappear.

Ive been trying to fix this issue for days, but couldnt locate my outbox.

As soon as I realized how large the file was, I tried to stop the send from the outbox while it was showing but it disappeared.

Now, I cant find the message anywhere but my Outlook is SLOW I keep getting the spinning circle with every few characters that I type.

I have tried all of the suggested steps above but the email is nowhere to be found.

Test machine with Outlook 2011 isnt working so I cant try the steps to see what might be wrong.:(.

Update history for supported Office versions is at Update history for Office.

Ms Outlook For Mac 2016 Outbox Error