I have an Exchange5.5 SP4 server on Windows 2000 server and I have set the Information store storage limits as follow: - Issue warning(K): 15000 - Prohibit send(K): 20000 - Prohibit send and receive(K): 30000 When my mailbox was over 15000K but I have received no warning message. Only until my mailbox was over 20000K then I received the warning dialog box told me that I couldn't send the message. Can you help me to solve this problem. I want to receive the warning message when my mailbox is over 15000K. Thanks in advance.