Slow attachment upload with Exchange Web Services (Outlook 2011 for Mac?)

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.

 
Hi ,
Does all the user occurred the issue ?
If only special user, I recommend you do the following steps and test:
1.Remove and re-add the email account and check if this helps to resolve the issue.
To remove and add the email accounts:
Open Outlook > GO to Tools > Accounts > Click on "Minus" symbol to remove and "Plus" to add an Email account.
2.Creating a new user profile:
http://support.microsoft.com/kb/2439218/
3. If the issue persists, rebuild the data base and check the results:
http://support.microsoft.com/kb/2360509
You can also post it on Office for MAC forum  to get special support about the difference between Outlook and Outlook for MAC.
http://www.microsoft.com/mac/support
Wendy Liu
TechNet Community Support

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