message never received

Hi

That's the second time that an email from outside is not delivered to outlook 2011 for mac.

I know about the emails because I got them on the iphone on the mail app, but those two never appeared on the mac, either in the quarantine box or inbox.

I tried synchronisation but to no avail.

The account is set up as imap, the same way on the iphone and on the mac outlook 2011.

Both time, I have been able to transfer the email from the iphone to the mac by the transfer function. 

Both time, it was very important email for work.

One of the emails had many files attached the other none but pictures in the body.

The account is set up with orange.

Have any of you experienced the same thing?

Do you know how to force emails to be received?

Is there something to do to avoid that?

Thanks