Hello, This post is after reading and posting same question in israel forum with no luck. attachment with extention .PPS will not open immediatly in OWA. there is a message requiring to save first. this extention is not present in LEVEL 1 nor in LEVEL 2 so apperently there is no reasone why it will not open. TNX

It's look like this kb issue but not completely . http://support.microsoft.com/kb/839948/en-us

Thanks for the Input. I do not get a credentials request - i simply get a message to save the attachment first: thanks

Hi, Here is the solution: In the registry under level-2 mime type remove the value application/octet-stream from the list of file types. All the best