Agreed - a bug as dumb as this should not be in a Customer Preview. On the other hand, users should be aware that this is a beta release, and that it should not be used as a primary email or calendar tool. I plan on installing this on a laptop that has Win 8 Release Candidate on it. It is not my primary PC. If a user wants to safeguard against this happening, they should make sure that the option to delete email from server when deleting from Outlook is NOT checked. I don't know how this bug might impact the Hotmail contacts or calendar. Hopefully, this will be fixed sooner than later.