Server 2008 in a mixed environment
Im looking for some advice.
We have five servers running a mixture of Server 2003 with SP2 and Server 2003 R2.
We want to upgrade one of these servers to Server 2008 with the eventual plan of upgrading all of them over time.
We are planning to upgrade our WSUS server to start with as it only deals with updates it wont be too much of a disaster if the update kills it.
Is it safe just to upgrade one server at a time of do we need to do them all at the same time. Is doing it this way going to cause problems for active directory. Is there a recommended way of going about an upgrade?