As noted in a previous update post on my Foxit PDF Previewer for Outlook and Vista/Windows 7, there is an issue in the Office 2010 64-bit Beta (specifically Outlook) for executing 32-bit preview handlers on 64-bit Outlook. I’ve got an update for those temporarily. First, I can confirm that the issue is fixed in the later builds of Outlook 2010, so this fix is indeed only temporary. Thanks to some assistance that Leo Davidson provided, I was able to provide a work around for my previewer that I’ve been able to confirm “works for me” on my installation...