Exchange 2010 Activesync with the Windows 8.1 mail app limited to 10 MB attachments?

We have a few executives that want to use the mail app on their 8.1 tablets to access our Exchange 2010 SP3 Ru7 servers via Activesync. They get connected and can sync mail, but when they
try to download attachments that are larger than 10 MB, they get an error (Sorry I don't have the exact wording) the error doesn't say anything about attachment size limit, but it works if the attachment is 9.5 MB and they get the error as soon
as the attachment is greater than 10 MB.<o:p></o:p>
I tested the app with the same attachments greater than 10 MB with an Outlook.com account and it works ok on the Windows 8.1 tablet.<o:p></o:p>
I also tested using an IPad against the Exchange servers and I can download attachments greater than 10 MB just fine.<o:p></o:p>
So it looks like only the combination of Exchange (2010 in my case) and the Windows 8.1 mail app has the limitation?
<o:p></o:p>

ActiveSync is limited in the same manner that OWA and web services are. See the following page to see how to increase this limit:
http://technet.microsoft.com/en-us/library/aa996835(v=exchg.141).aspx

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Windows 8.1 Mail app limitation

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I tested in my own mail app, I can successfully send the pictures, I can also send more large documents like word\PDF.... As I know, mail does not enforce any limits on number and size of attachments users can send.
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We have a 10 node DAG (Exchange 2010 SP3, Windows 2008 R2), with 2 CasArray.
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We have a GoDaddy's 256-bit SSL class 2 certificate could this be a culprit?
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http://blogs.technet.com/b/exchange/archive/2012/11/26/supporting-windows-8-mail-in-your-organization.aspx
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http://blogs.technet.com/b/exchange/archive/2013/10/18/supporting-windows-mail-8-1-in-your-organization.aspx
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Exchange 2010 coexist with exchange 2013

Hi All ,
Planning to have a coexistence scenario in my environment which is mentioned below
Exchange 2010 - ambiguous url in place - OA enabled
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Hi,
Going Straight to the point... and answering your question...
The scenario above IS possible For a while... But going ahead in the migration process, You'd face problems once the Exch2013 doesn't know how to handle MAPI connections:
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In this scenario where both the MAPI/RPC and HTTP workloads are using the same FQDN you cannot successfully move the FQDN to CAS 2013 without
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Outlook 2010: 14.0.6126.5000 (SP1 + the November 2012 Public Update or any later PU)
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From <http://blogs.technet.com/b/exchange/archive/2013/07/17/3574451.aspx>
Hope it can help you!
Cheers,
Think before you ask, give detail as much as possible, then ask and you will get help! Always have in mind, people do not guess! :)

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