Although I have not found a way to use our PCOM accounts with another mail client, you can forward a copy of your incoming emails automatically by following these steps:
1. Log into your PCOM Groupwise account
2. Open the options window (click the center button at the top next to exit)
3. Click on the 'Rules' tab
4. Select 'Forward' in the drop-down box and click 'Create'
5. Type in a rule name (such as 'email_forward')
6. Leave the conditional statement blank to have a copy of all new messages forwarded
7. Type the email address you want the messages forwarded to in the 'To:' box
8. Click the save button
9. Click the save button again
I just set mine up this weekend and it works fine. Let me know if you have any questions