How to increase CRM 2011 Attachment File Size from 5MB to Maximum 32MB
In CRM 2011, we have a supported way to change the file size limit from 5,120KB (5MB) to 32,768KB (32MB) in here
* Click Settings > Click Administration > System Settings
* Under the Email tab, select the file size for attachments
* Enter the new file size > Click OK
Yes. It's that easy!!