All is sorted We have direct links and support with Microsoft over in the US so we asked them to step in. Within 12 hours all is sorted. Here is what we did. Request Filtering Header length needs to be set in IIS. -Open IIS -Select the CRM Web Site -Select Request Filtering -Select the Headers tab -Set Content-Length to 40000000(if it’s not there, you will need to add it-see attachment) ( i think this solved it personally) Set the ‘Set file size limit for attachments’ in Dynamics CRM. Settings>>System Settings>>Email: to 40,000 The maxRequestLength value needs to be added/adjusted in the Web.config file. An example file has been attached. This needs to be set in two sections of the config file. See if it works :)
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