I'm confused. OWA is just a web-based client for Exchange. As long as your e-mail admins allow POP3 or IMAP access to your company e-mail, BIS should work fine. OWA doesn't enter into it, as far as I know.
If your on Exchange 2007, BIS cannot integrate with OWA, yet. RIM is aware of the problem, but doesn't have a fix. If POP is enabled, then you're ok. You can always forward the email to you email@example.com account.
If you have access to your Exchange Active Directory then you can do it yourself else you will need to request this from your IT admin...
Just incase you are interested to know how its done:
1. On active directory create a new contact
New -> Contact -> Enter any name -> Press Next -> Select Modify -> Select SMTP Address ->Enter your BlackBerry Address -> Apply -> OK -> Next -> Finish
2. Enable Forwarding
Double click on your user account -> Click on Exchange General Tab -> Select Delivery Option -> elect Forward to and then Modify -> Enter the name of the new contact created earlier -> select Check Name -> OK -> Ok -> Apply -> OK......
Have done this for my fellow collegues..
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