I’ve not received any emails in my inbox since I upgarded to Snow Leopard. If you ‘re upgrading your Mac and use Personal Antispam, you will find that the new version of Apple Mail will remove the Antispam plugin. However, it DOES NOT remove the rule from your Apple Mail rule set. This means that ALL of your email will be pushed into your Junk Mail filter without filtering.
To get around this problem, simply delete the relevant rule from Mail Preferences.