Retain 3.x Exchange Module
Users need to send attachments larger than the default through Exchange. There are many settings that need to be adjusted so that a message can move through the entire Exchange system properly. Note: These instructions are provided as a convenience. This is not required for proper Retain operation.
Message Size Limits (MS technote)
Configure client-specific message size limits (MS technote)
Large Attachments and/or Messages Cannot Be Archived
In Exchange you can set different limits depending on your system design.
Organizational LimitsThese can be changed in the Exchange Admin Center (EAC) or via the Exchange Management Shell (EMS). This article will focus on the EAC. And the Organizational and Connector limits since those will effect all users.
Changing Organizational Limit:Maximum size for messages received (default 10MB)
Mail flow > Receive connectors > More options > Organization transport settings > Limits tab > Maximum receive message size
Maximum size for messages sent (default 10MB)
Mail flow > Receive connectors > More options > Organization transport settings > Limits tab > Maximum send message size
Changing Client-specific Limit:On each CAS, you will also need to change the Exchange Web Services web.config files and the Outlook Web App web.config files as specified in Configure client-specific message size limits (MS technote).
This article was originally published in the GWAVA knowledgebase as article ID 2442.