MAC 2011 User Unable to send large attachments

Posted on 2011-10-10
Last Modified: 2012-05-12
We use Exchange 2010 server , one server having Mailbox and Hub Transport role and other server having CAS role configured. User who use MAC having issue as they are not able to send email having large attachment email. Email with few MB file can be sent but not the large attachment. We want to allow MAC users to send email up to 50 MB attachment size. What we need to do to get it done.
Question by:ShailendraJadhav
    LVL 5

    Expert Comment


    It describes a comparable problem.
    It has to do with Apple and the support of mail protocols...
    LVL 21

    Expert Comment

    If your Mac users are using Outlook for Mac, then you need to change the size limits for the transport.

    If your Mac users are using EWS/OWA, then you need to make the changes in the following link.

    Author Comment

    We folowed follwing process but after that implementation MAC users even not able to connect to Exchnage server we had to revert back setting as default to MAC users connect to Exchnage 2010.

     (For 50Mb)

    Browse to:      C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\exchweb\ews
    Copy all web.config files

    Open web.config with Notepad and find maxrequestlength and change to 51200000

    Open CMD and paste these four commands

    cd \Windows\System32\inetsrv
    appcmd set config "Default Web Site/ews" -section:requestFiltering -requestLimits.maxAllowedContentLength:51200000
    appcmd set config "Default Web Site/owa" -section:requestFiltering -requestLimits.maxAllowedContentLength:51200000
    iisreset /noforce

    Please assist us to resolve this issue.Is this because we have put 50 MB, do we need to to configure setting less than that to resolve issue of sending large attachment?
    LVL 21

    Expert Comment

    Clarification on my original answer, I have since read that Outlook for Mac does not use MAPI as I incorrectly assumed, I apologize.
    Both Entourage and Outlook for Mac connect to Exchange Server via HTTP protocols. Neither uses the MAPI protocol as does Outlook for Windows. Exchange Server 2003 and 2007 both support the WebDAV protocol. Exchange Server 2007 and 2010 both support the Exchange Web Services (EWS) protocol.

    Author Comment

    Thanks for your quick responce . we had tried the solution in
    When applied it , it stoped MAC users from connecting to Exchange serer . We had to revert back earlier setting again to MAC users work.In above link solution one step we skiped that is rebooting server but yes we did iisreset /noforce but no luck.Do we need to have reboot server after following those steps in link.Please assist.Was that the reason (reboot server skipped) we didin't get success even after following stpes in support link.
    LVL 21

    Accepted Solution

    I'm not sure about any steps that are required after following the instructions in that link, hopefully an Exchange pro can help you out.

    Author Closing Comment

    Have been following since long time.Haven't got solution yet. Hence will create new case for the same to get quick responce. Thanks

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