First thing check what is set for email option under IE7 Programs tab. If that is correctly set to Outlook (making an assumption that is what you are using) and not set to something like Outlook Express, I believe your best bet would be to uninstall 4.3 and go to version 4.2 SP2 and see if that corrects the problem. Blackberry a few times have come out with buggy versions and you have to wait for the next SP to come out for that version to get a less buggy version. Perfect example why version 4.2 has 2 service packs.