I have checked everywhere I can think of in Exchange 2007 and my users still cannot send attachments over 10mb. What am I missing?

Hello, On Global Setting, Sending & Receiving -- Maximum message size should be same. Which every the Least limit on any of those place will take precedence. And whatever the least Size limit is set on the MAILBOX user, it will take affect. According to your Requirement :-- Setting Message Size Limits in Exchange 2010 and Exchange 2007 1) Organizational limits: Set-TransportConfig -MaxReceiveSize 50MB -MaxSendSize 50MB 2) Receive Connector limit: Set-ReceiveConnector “CONNECTOR NAME” -MaxMessageSize 50Mb 3) Send Connector limit: Set-SendConnector “CONNECTOR NAME” -MaxMessageSize 50Mb 4) Mailbox limit: Set-Mailbox “User A” -MaxSendSize 20Mb -MaxReceiveSize 20Mb It will fix your issue.EXCHANGE2010, MCSE, MCTS, MCSA MESSAGING, CCNA & GNIIT