Users are attempting to access their Exchange Server 4.0 mailboxes using Outlook Web Access (OWA). OWA was a new feature introduced with Exchange Server 5.0; therefore, it is not available for Exchange Server 4.0.
OWA may work in some read-only cases, but it is not tested or supported for Exchange Server 4.0, only for Exchange Server 5.0 and 5.5.
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OWA relies upon Collaborative Data Objects (CDO) technology that was not present in Exchange Server 4.0. At that time, the technology was referred to as "Active Messaging," which later became CDO in upgrades and a renaming of that technology.
Although you may get some response from Exchange Server 4.0 when you attempt to use OWA with that version, key objects needed for full functionality, such as Send and Reply, are beyond the capabilities of 4.0. The users must have their mailbox accounts upgraded or moved to Exchange Server 5.O or above to obtain full OWA functionality.
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