To export the certificate right-click on the certificate and select All Tasks -> Export.

-> The Certificate Export Wizard is opened.

Select Next.

Select No, do not export the private key and select Next.

Select DER encoded binary X.509 (.CER) and Next.

Select Browse....

Select the location and a name for the exported certificate and select Save and select Next (In this example the location will be the C:\ drive and the name of the file will be certificate).

Select Finish and OK. The export process is done. Distribute the exported certificate to all clients.