We're experiencing slow attachment upload with Exchange Web Services versus MAPI, OWA, and Outlook Anywhere. I'm not totally certain that it is Exchange Web Services or specifically Outlook 2011 for Mac. I attempted to test with the Mac Mail App, but it makes it difficult to tell when the attachment has been uploaded and the file has been sent. Here's what we're seeing (10mb file):
MAPI / RPC/HTTPS / OWA: 10-15 seconds upload time
Exchange Web Services (Outlook 2011 for Mac): 60-90 seconds upload time
Thoughts? Any idea why we would see such a drastic difference in attachment upload time? Any way to prove definitively that it is Exchange Web Services vs. Outlook 2011 for Mac? We've tried it from multiple locations with multiple different machines, and although the upload times vary (some locations have more bandwidth etc) the ratios remain similar.