Windows users are not receiving attachments sent out of Mail

I am a consultant. I use Mail in Snow Leopard. Software is up to date.
Our business uses Microsoft Exchange Server 2003. All other consultants in the company are using Windows. In Mail I connect via IMAP. It has worked flawlessly until recently.
Recently, my corporate clients (various clients not related to one another nor using the same email server) have complained that they are not receiving my email attachments. It is not universal. It is inconsistent, even with the same client. Sometimes the attachments are there and sometimes not.
I have verified two things. 1) That the attachments are present in the emails in my outbox. 2) That the emails leave our server with the attachment (I accomplished this by contacting our Microsoft Exchange service provider and giving them examples, which they tracked down and verified that the emails left them with the attachments.).
Our service provider suggested that Mail is adding something to the email that is causing Outlook (the common denominator is that the clients receiving the emails are all on Outlook) to strip the attachment. Or, the antivirus is stripping it. Something about the Mail email is causing Outlook or some antivirus software to strip the attachments.
Has anyone else encountered this? Is there something that can be done?
Right now I've had to go to Thunderbird in order for my attachments to be received. I'd rather stay with Mac all the way, but I cannot trust that my clients will receive attachments.
I'm hoping that when our company changes to MS Exchange Server 2007, that the problem will go away, since Mail can interface with the 2007 version directly. But, until then, I would really like to stick with Mail, if I can find a work around.
Thanks.
Matt

I am now having exactly the same problem.  But here is a new wrinkle.  ALL the persons having the problem you describe - that attachments are stripped off - are using cox.net as their e-mail provider.   I am not saying that all cox.net mail users are having the problem, but those having the problem are among the cox.net e-mail users.  None of my recipients using aol.com, yahoo.com, gmail.com, verizon.net, zona.net, etc. are having any problems.  Only some of the cox.net e-mail users. 
I suspect but have not checked that they are all PC users (I use a Mac with Mail) and, now that I have become aware of this thread, I will check if they use Outlook.
It started a few months ago.  I had no problems before and now this, with the same people.  Obviously something must have changed but what?
Please let me know if you have found anything more about this - or even a solution?  :-)

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