Originally Posted by KonTiki
You can have both a BES and a BIS. It will not mess up anything in your setup. And you should be able to switch between BES and BIS when you respond.
I just want to make a correction to that if I may.
KonTiki, you are correct that you can have both a BES account and a BIS account on a BlackBerry.
When composing new emails, you can switch between Desktop (BES) or WebClient (BIS). This can be done by changing what's in the "Using" field between "Desktop" and "Web Client" when composing a new email.
However, when replying to an email, you do not have the ability to change this. You can see which account (BIS or BES) the original email was sent to by looking at the "Using" field. However, you will notice that you do not have the ability to change this field when replying to emails. If an email was sent to your BIS account, you can only reply to it using your BIS account. If the email was sent to your BES account, you can only reply to it using your BES account.