The MSO file format has not been documented by Microsoft, and such files are not meant to be directly opened by the user. The original attachment may be accessed by opening the e-mail message in Microsoft Outlook (Microsoft Entourage). This page explains how you can easily convert a.mso file to a PDF using free and easy to use tools from PDF24. The methods to create PDF files explained here are free and easy to use. A PDF creator and a PDF converter makes the conversion possible. The PDF24 Creator installs for you a virtual PDF printer so that you can print your.mso file on that printer in order to convert your file to PDF. How to open oledata mso file I've been looking all over on how to open a 'oledata.mso' but to no avail.I'm using vista.the mso file message was sent to my yahoo account,i forwarded it to my windows mail thinking it would open the file, (correct me if wrong:windows mail is a predecessor to outlook?) but but it did not. Click on the silly.action file and select the search for app (on your own PC) and select Acrobat READER DC - it's a free download if you don't already have it. O/ Go figure, it wouldn't open with my Acrobat PRO XI but Reader was the solution. Of course once it's open you can then 'print to PDF'.
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