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Problems opening msg attachments in Outlook 2003

I found an interesting problem from some of our users. The problem reported was that if they open an msg attachment in Outlook 2003, it opens the first time but if they close the attachment then try to open the attachment again, they get an Operation failed message. I could open any other kind of attachments twice with no problems. I created an Outlook profile for myself on their computers and got the same problem so it's not a profile problem. I noticed that this problem affected many users on a same section. I was finally able to zero in on the only difference that distinguishes the users with this problem from those that don't have the problem. All users with this problem all uses Adobe Acrobat 8.0 Professional. We use Office 2003 with SP2 on Windows XP. I suspect that if we can find the API from Adobe for Outlook we can fix this problem but don't know which one it is or how to proceed. Did anyone seen this before?
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Greetings 1warrior11 !

Sounds like your Outlook cache is full.  Delete the files in OLKxx folder.  Here is how to navigate to OLK folder

Hope this helps, war1
1warrior11Author Commented:
No, it could not be it. The one thing they all had in common was Adobe 8 Pro. I found the answer though.It was the PDFMaker plug-in in Outlook just as I thought. All I had to do is go in the registry to the following key: HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Outlook\Addins\PDFMOutlook.PDFMOutlook\ and change the value of Change LoadBehavior key from 3 to 0. All I was trying to figure is how to remove this plug-in for Outlook which is rather useless. I found it on this site actually:
I would like to thank you war1 for your suggestion though.

Glad you found a way to remove the plugin.  Another way to remove an Outlook plugin is to rename or delete the extend.dat file.
This fixes the issue...

Click on Addins One by One
Change LoadBehavior Value to 0&
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