I don't know if this is related but here goes, earlier this week we had a real good thunderstorm and it wasn't until tonight that I noticed all e-mails were coming into my account, all the computers at home have four user accounts and four e-mail addresses, is there a way of getting the e-mails to go to the user account instead of into my account. I'm using Windows 7 64 bit and Outlook 2007.
Have separate mailboxes (rather than aliases) been set up for each e-mail address in Manage My Mail? If they have, e-mails should be delivered to the appropriate mailbox so individual users can collect them from username+mailboxname using the mailboxname password. Mail for the default mailbox will be collected from username using the main account password. It would be peculiar for thunderstorms to change existing behaviour except perhaps if local power cuts were experienced at an awkward moment and affected settings in your e-mail program.