If you suddenly experience all of your emails downloading again, here's a few possible culprits:

Quota

When an email account hits it's quota -- it cannot update the account cache file and essentially marks everything as unread.

To correct this:

1. Login to your cPanel account
2. Go to "Email Accounts"
3. Ensure the account has enough storage allocated and isn't full. Adjust if necessary!
4. Let the remainder of the emails download, mark them as read and it should correct itself

Ensuring there's enough quota available will prevent this issue. If your entire hosting account is near it's quota, reach out to us and we'll happily adjust it.

Outlook Profile Corruption

If you are using Outlook and are nowhere near your quota, it's possible that one of the .pst files in which Outlook stores email data got corrupted. To fix them, you'll need to follow instructions based on your particular version of Outlook. Microsoft has instructions to repair your Outlook profile.