For months we have had problems with attachments from Quickbooks. Having looked down many avenues I think we have found a fix or few: (See below for update) Here are a few websites that help out: Microsoft Outlook/Exchange MS-TNEF handling (aka "Winmail.dat", "Win.dat", or "Part 1.2" problem of unopenable email attachments) http://news.office-watch.com/t/n.aspx?a=716 KB958012 : When you use Outlook 2007 to send an e-mail message, the recipient of the message sees an attachment that is called Winmail.dat Essentially the summary is that there is a problem with Outlook trying to force Rich Text Format. so you need to turn that off. Mail users not receiving email in an Outlook derivative will have a problem. This format is called So: Go into Outlook On the "Tools" menu, click "Options", then click the "Mail Format" tab, and then the "Internet Format" button. Set "When sending Outlook Ri
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