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

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    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.

    Tuesday, March 06, 2012 3:33 PM
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    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


    Thursday, March 08, 2012 7:37 AM
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    The issue is not user specific - all users experience the issue (it is not site specific either)
    Thursday, March 08, 2012 1:43 PM
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    Hi,

    Sorry to reply so late.

    We have determined that Outlook 2011 uses the EWS protocol, which because of Mime Content Conversion, increases file size by 30%. The EWS protocol uploads emails a bit slower, which is by design.

    I'm find above answer from our Office for MAC forum.

    Outlook 2011 slow sending attachments to Exchange 2007:

    http://answers.microsoft.com/en-us/mac/forum/macoffice2011-macoutlook/outlook-2011-slow-sending-attachments-to-exchange/de885cda-b9a4-4700-a014-917e18d8d1fb

    The detail you can post on Office for MAC forum to get support.

    Office for MAC forum:

    http://www.microsoft.com/mac

    Wendy Liu

    TechNet Community Support

    Tuesday, March 13, 2012 3:42 AM
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    Thanks for the info.  This particular reply is very disconcerting:

    "This is a known issue with Outlook2011 due to MIME conversion  and the EWS interface into Exchange. Opened a a call with Microsoft and they were able to replicate the problem. The best performance they were able to see were 50Kb/sec upload peaks but much slower on average. This occurred in both their Exchange 2010 and Exchange 2007 lab. I was not given any indication when this would be fixed."

    So is this listed as an official 'bug' or any timeline for resolution at this point?

    Wednesday, March 14, 2012 6:25 PM
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    Hi ,

    Sorry, we are Exchange Server Forum and have not professional technical for Outlook for MAC.

    I recommend you post it to Outlook for MAC forum to consult.

    Wendy Liu

    TechNet Community Support

    Thursday, March 15, 2012 2:43 AM
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    Hi ,

    Sorry, we are Exchange Server Forum and have not professional technical for Outlook for MAC.

    I recommend you post it to Outlook for MAC forum to consult.

    Wendy Liu

    TechNet Community Support

    I understand that, but there is no definitive proof that this is an Outlook 2011 issue versus an Exchange Web Services issue.
    Thursday, March 15, 2012 7:06 PM
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    Hi ,

    Please try to upload the small attachment and verify if it also very slow.

    If yes, It might be the server issue or the server connection issue.

    If no, the issue is attachment size.

    We can solve it via the following link.

    Allow large attachments for EWS clients such as Entourage and Mac Outlook 2011:

     http://social.technet.microsoft.com/wiki/contents/articles/allow-large-attachments-for-ews-clients-such-as-entourage-and-mac-outlook-2011.aspx

    Wendy Liu

    TechNet Community Support

    Friday, March 16, 2012 4:44 AM
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    The Outlook for MAC forum says it's an Exchange Server Forum question, as they are blaming the EWS... which would fall under the Exchange Server Forum...

    Looks to me like EWS has some strange throttling going on...? But where would you change this setting?!

    I have the very same problem, Mac users on the LAN sending a 20 MB attachment, can take up to 10 minutes...! (I have already increased the size limit, since it completely failed before)

    Wednesday, March 28, 2012 2:36 PM
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    Agreed.  Thanks Perski for reminding me to unmark that as an answer ;)
    • Proposed as answer by Perski Wednesday, March 28, 2012 8:03 PM
    • Unproposed as answer by Perski Wednesday, March 28, 2012 8:03 PM
    Wednesday, March 28, 2012 7:56 PM
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    Actually, I found this other thread, and it sounds like Outlook 2011 is to blame... somebody tested Outlook 2011 v14.1.0 and it doesn't have this issue, but v14.1.3 and v14.1.4 (the latest version) does...

    Not sure if it is a combination of EWS not being configured just right, or if it's solely an Outlook 2011 bug...?

    http://answers.microsoft.com/en-us/mac/forum/macoffice2011-macoutlook/outlook-2011-slow-sending-attachments-to-exchange/de885cda-b9a4-4700-a014-917e18d8d1fb?page=1&tm=1332964972383

    • Marked as answer by tyler gohl Thursday, March 29, 2012 1:36 AM
    Wednesday, March 28, 2012 8:13 PM
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    Thanks Perski.  It's disconcerting to not see any official word from MS that this is a bug.
    Thursday, March 29, 2012 1:37 AM
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    does anyone know if service pack 2 (v14.2.0) fixes the issue?
    Wednesday, October 31, 2012 2:47 PM
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    Hi, I'm wondering if there's any solution to this problem. We're using Exchange 2010.
    Tuesday, October 28, 2014 1:53 PM
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    Fastguy,

    Wow, over 2 years since we discussed this, and I had completely given up and forgotten about it. Our workaround at the time was to use OWA. (Outlook Web Access) But I just tried it using Outlook 2011 again, and it looks like it has been improved. 10 MB file now taking about 40 seconds. OWA still much faster though, about 10 seconds. Not sure what improved it though. Currently using Exchange 2010 SP3 Rollup 6 and Outlook 2011 v14.4.5.

    What versions are you using?

    Tuesday, October 28, 2014 2:33 PM
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    Fastguy,

    Wow, over 2 years since we discussed this, and I had completely given up and forgotten about it. Our workaround at the time was to use OWA. (Outlook Web Access) But I just tried it using Outlook 2011 again, and it looks like it has been improved. 10 MB file now taking about 40 seconds. OWA still much faster though, about 10 seconds. Not sure what improved it though. Currently using Exchange 2010 SP3 Rollup 6 and Outlook 2011 v14.4.5.

    What versions are you using?

    Maybe it could be in the "Connection Limits".

    Try going into the IIS in the Exchange Server >> Default Website >> Request Filtering >> Advance Settings. I think the default setting should be 120.

    Tuesday, December 08, 2015 7:24 PM
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