Mac users cannot attach files in OWA
macos
Symptoms
Cannot attach files to OWA messages on a Mac.
Likely cause
Silverlight (which Mac OWA used for attachment upload) is not installed.
Fix
1. Close OWA.
2. Install Microsoft Silverlight from microsoft.com/getsilverlight.
3. Log back into OWA and attach the file.
Sourced from militarycac.com. Rewritten for clarity.
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