Keep the same URL to access OWA

Hello all,

I hope that you are well !

I have a question for one of our customers.

I already completed Exchange migration in the future (2003-2010).

But I always wondering if a customer access is OWA with https://mail.abc.com/owa when is on Exchange 2003.

If we want to keep the same URL when we install Exchange 2010 in co-existence with Exchange 2003...is this possible.

I use to chose another URL for the migration so, instead of using https://mail.abc.com/owa we use https://webmail.abc.com/owa so it's much easier I think for certificate and so on...but maybe I am wrong.

Can anyone point me to correct configuration so I can retain mail.abc.com on a migration of Exchange 2003 to 2010.

Best regards,

Stephane