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If you have installed Microsoft Office Outlook 2007, it will set itself as your default mail client. Hit the Windows ball or Start button on the lower left of the desktop - All Programs - Outlook Express. When it opens; hit File - Export - To Outlook (Messages). Outlook Express will export all of your messages, contacts and account settings to Outlook 2007 and you will be able to use the better, upgraded Outlook Mail client.
Are you using Yahoo or other 3rd party email or a client (like Outlook)? If you're using Outlook (or other client) you need to re-setup your email address and password so Outlook can connect with your email source.
First thought is that your certificate expired. That would explain why it would work one day and not the next.
Next thought is that you made a change to the IIS server they use to sync. Try deleting the partnership on one phone and recreating it.