Hi, We are currently having 2 e mail domains, one is on Exchange5.5 on Win2k server(let's name it as mydomain.com) and other on a unix machine with a seperate IP address(let's name it as company.mydomain.com) for the internal staff members. Now we need to transfer company.mydomain.com server(which is on Unix) also to the exchange server. I learnt that this is possible by changing DNS settings and IMS of Exchange. But can I keep the existing IP for "company.mydomain.com" in exchange server? if so how to edit the dns? Currently those who login to unix server has "company.mydomain.com" as its smtp/pop3 on their client pc's. Should this setting be changed as "company.com" or can I continue as it was.? Appreciate any advice to initiate the process Rgds,