Can't open msg files from sharepoint I set the browser file handling to permissive but still can't select open only save?
Although your web application has "Browser File Handling" set to "Permissive" it is still possible that the document library in which your .msg files are stored has its "BrowserFileHandling" property set to "Strict". Please take a look at this post
http://social.msdn.microsoft.com/Forums/en-US/sharepoint2010setup/thread/95a9f8fa-3da6-4bb7-9983-2102910ff4aa where I offered a way through PowerShell to check the document library "BrowserFileHandling" property and change it to "Permissive"
if necessary. The linked post is in reference to PDF files, however it is the exact same issue you are expeeriencing with .msg files.
I hope this helps.