Hello we have exchange server 2007 running lets say my domain is mycompany.com and my exchange server name is mail. we access owa https://mail.mycompany.com/owa OUR DOMAIN IS REGISTERED WITH ISP AND WE ARE SHIFTING TO OTHER ISP because of their poor service. So now i have to register domain with new isp What records for my exchange server i am supposed to add in the domain registration with new isp and also my real ips are going to change so does it affect any of my services and also does it affect my blackberry users and also my outlook clients plese guide me as i have 2000 users who use exchange

If your changing over ISP, then consider some of the following MX records, if your ISP hosts them, where they point to A records for OWA, autodiscover on your public DNS servers any SPF records you have published if youre using them (make sure the right IP is set as youre changing, if applicable). PTR records with correct IP. Sukh