The Home User version of VPOP3 is like a 5 user version, but it has the following restrictions
There are no External Autoresponders
There is no Mailing List Server support
There is no LAN Forwarding
There is no VPOP3 File Transfer Server (there is a VPOP3 File Transfer client)
There is no External Router support
There is no Outmail Processor support
It does not support the FaxServer addin.
It only supports a single Connection (instead of 10)
It only supports up to 5 In Mail methods (instead of 1000)