I noticed an email did that in Outlook on my work laptop last week. I found it in the Outbox (something I've never used - my mail is either a draft or is sent). I forwarded it to the person I'd originally meant to send it to and asked if she received it the first time, and she had.

I wonder if this is some new update that Windoze has put up for Outlook? I use the Mozilla Thunderbird program as my resident email manager on my home computer and I download all of my posts, but leave a copy on the server as backup. I don't use Outlook if I don't have to.

SRS