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How do I merge or forward my Google mail with my GroupWise email?
To set this up, follow the process laid out here → https://support.google.com/mail/answer/10957?hl=en
Make sure you pay careful attention to step #10. After putting in confirmation code, you them MUST TURN ON forward or it will still not work.
It is highly recommend to also do a test email after they think they are done.