Outlook 2003 blocks ALL attachments all of a sudden

Desktop Operating System:  Windows XP Pro, Service Pack 2
Application:  Microsoft Outlook 2003

Last night, when an email came into the CEO's inbox, She was able to double click the pdf file attachment and it would open.  This morning, when she would try to open the same type of attachment, it gives the following error: "This file may contain a virus that can be harmful to your computer..."  It will allow for her to save it and open it from the saved location, but not from Outlook.  This changed overnight.  The Automatic Updates is configured to download the updates and ask to install them.  It blocks ALL attachments, pdf, doc, xls... not just the defualt attachments for Level 1 security.  any ideas on what could have happened, and how to correct this problem?
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David LeeCommented:
Greetings, sprice6185.

It seems likely that this is probably the result of an update being applied.  Perhaps the CEO had applied an update and hadn't rebooted yet?  After this boot the update took effect.  The only other possibility I can think of is that this is an Exchange environment and the Exchange administrator changed a setting to block all attachments.


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