Hi,
This is now my third post regarding this issue. Please can someone just help me already!!! I am SO frustrated.
I am using a Mac on the Mavericks OS. When I use Outlook in O365, I get an error as above with the code -18500.
I cannot send, forward or reply to mails with attachments. I can only receive mail and send small mails with no attachments.
I see this is a common problem, yet, no answers from Microsoft.
Please advise urgently!!!!!!!!!!