In Exchange 2003 some of the default settings were changed to tighten security. One of these settings is the sending and receiving message size settings. In Exchange 2000, no default size was set,...
Updated Jul 01, 2019
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Be Aware of Message Default Limit Changes When Upgrading Exchange 2000 to Exchange 2003
These global settings do not affect move mailboxes. These global setting apply specifically to sending and receiving limits, not the message size limits for the mailbox, but limits imposed when sending and receiving.