iOS 7 and sending emails larger than 40KB from Exchange accounts

The Server enviroment is SBS 2008,
Exchange 2007, IIS 7. My end users with the latest iphone IOS 7 are intermittenly having issues sending or forwarding emails. The message they see implies that the message is to large. This can occur even with a txt only message, (no attachments)
I've seen apple forums pointing at the exchange server as the problem, stating that the
setting in IIS for  UploadReadAheadSize setting should be increased.
I'm not having this issue with any Android devices or Apple devices before IOS 7.. Has anyone else seen this and found a solution to this ?
hounschellAsked:
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hounschellConnect With a Mentor Author Commented:
Thanks Nrode,

I applied these two commands and restarted IIS and will test over the next couple of days to see if the issue is solved...

With the following command you can change the value (in this case 10MB):
 C:\Windows\System32\inetsrv\appcmd.exe set config -section:system.webServer/serverRuntime /uploadReadAheadSize:"10485760" /commit:apphost
 
C:\Windows\System32\inetsrv\appcmd.exe set config "Default Web Site" -section:system.webServer/serverRuntime /uploadReadAheadSize:"10485760" /commit:apphost
 
jerry
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Nick RhodeIT DirectorCommented:
This resolved it for me

http://social.technet.microsoft.com/Forums/exchange/en-US/52f58b47-b95e-4f44-bb4e-6bd8b1b4eb94/iphone-sending-attachment-problems 

Even though this is for attachments it still applies to the read heads which was my problem (48kb limit).  Ironically I did not have this problem until iOS 7
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hounschellAuthor Commented:
So far so good...
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