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PDF attachments sent from Outlook2003 arriving as .dat files

Client PC has sent email with  PDF quote attached.
When sent sometimes - today 3 out of 4 times to one person, the email arrives with the attachment in bits

The attachment .dat is the PDF because if i rename this file it is the PDF and opens fine. However, in a corporate environment where people cant be bothered to do anything other than click open its a problem.

Why is this happening occasionally? I am assuming it is just a compatibility issue with whoever is opening the email. As if i forward a copy of the same email to myself it arrives as .PDF with no problem.

Using exchange 2003 in house. Incidentally moving to Exchange 2007 soon - so as part of this question am I likely to see less of this when this upgrade occurs?
1 Solution
Change the default message format from RTF to either HTML or Plaintext
JohnSchneiderAuthor Commented:
I will check this tomorrow.
From memory though it is probably already in HTML as there is a fancy signature on the emails by default - so I am assuming HMTL in use.

Incidentally - this appears to happen when emails are generated through an application which then creates / starts the emal and attaches the file .pdf itself - just leaving the user the add a few lines if they want and press send.

I will check it all again tomorrow and get back ...
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