I have NT4 server and Exchange 5.5 installed on this server. Now i need to upgrade e-mail system to Windows 2000 with Exchange 2000 Enterprise server. I have new server hardware with Windows 2000 installed, but i can`t join Exch2k to existing exchage group, becouse Exchange 5.5 on NT server without ServicePacks. I can`t install there SP, becous there something wrong with Echange. When i try to install SP, setup says that Exchange server have that SP and setup exits.
Can someone tell me steps to migrate exch accounts from Exchange 5.5 to Exchange 2000 over another exchange 5.5 with SP`s, and can i leave Active directory domain in mixed mode?