Email attachment issue on iPhone devices - Exchange 2013

Dear Community,

We have Exchange 2013 on premises environment. Users can send/ receive emails through Outlook client and OWA with attachment up to 20 MB. While users who are trying to send emails with attachment through iPhone - they can't do that.

Please note while we tested it on Android devices, there were no issues. It is only happening on iPhone devices.

While we were searching for this solution - we found out this link: https://technet.microsoft.com/en-us/library/hh529949(v=exchg.150).aspx

Which says, we need to make change in Webconfig file - i would like to know, if anyone have done this or is there any better solution available for this issue. please suggest.
Syed ZeeshanAsked:
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Sunil ChauhanExpertise in Exchange Server, Office 365 & Powershell ScriptingCommented:
yes, we had to make the same changes in our environment,

Requirement: To change the ActiveSync Maximum Attachment Download size limit to (35 MB)

Change Plan:

1. Take a backup of the web.config file under D:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Sync located on the CAS server. Save the file to a different location on the same server you are making a change.

2. Change web.config in /Sync folder by changing values of MaxDocumentDataSize (this one relates to attachment/message download)

Current Value: <add key="MaxDocumentDataSize" value="10240000"></add>

New Value: <add key="MaxDocumentDataSize" value="36700160"></add>

3. changed web.config in /Sync folder by changing values of MaxRequestLength (this one relates to attachment/message upload)

Current Value: <httpRuntime maxRequestLength="10240"/>

New Value: <httpRuntime maxRequestLength="35840"/>

4. reset IIS with iisreset command

you can modify as per your requirement.
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Jackie ManCommented:
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Syed ZeeshanAuthor Commented:
Thanks. We made these suggested changes and it worked for us.
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