Download
- the Standard package (it only contains MSH2) or
- the All-In-One package (it only contains .NET framework and Windows Installer)

Prepare Microsoft SQL Server Express to work with MSH2:
- download and install SQL Server Express,
- to create DB, launch MSH2/DB_Create/CreateDb.bat

Install MSH2 client. Launch MSH2 client.
Configure MSH2 client in the Options section by inserting of PartyId and SMTP&POP parameters.

Configure collaboration between a party and you, to exchange XML documents.
Create or edit very quickly an ebXML CPA agreement with CPA-FastEditor.
Put the resulting CPA in MSH2/CPA/ folder.

Prepare XML document to send to business party naming it, manually or automatically, with the syntax convention, for example:
MSH2_IT-12345678909_0_154.xml

Send the XML document only moving it in the MSH2/Outbox/ folder!