implementing win2008 and exchange 2003 in currently running server win2003 and exchange2003
i want to upgrade win2008 and exchange 2007 in my organization with currently running win2003 AD with exchange 2003 running in exchange cached mode and service more than 50 users.
is it possible to install it without loosing exisitng mails and datas
Once you've set up the Exchange server (which will require setting up send / receive connectors and a few other things) you can move mailboxes, public folders, and other things (perhaps schedule free/busy, Offline address books, etc.).
THen retire the old server. This isn't a comprehensive explanation, but MS has articles about installing the server, and the steps to remove the old server.