I run openSUSE dual boot on my laptop and on on a desktop.
Be careful installing Windows after Linux - it tends to blow away the boot loader.
its usually windows then linux if you want the easier way...
read about GRUB if want the other way around...
GNU GRUB - GNU Project - Free Software Foundation (FSF)
Yeah, actually everything I have read seems to point to Windows first and then Linux. Shame, got a nice new server here with software set to run on Linux but underused and wanted to use the server for something else. Look like may have to bite bullet and start again! Thanks all
jaykay : might want to look at VMWare's ESXi Hypervisor ... ( VMware ESXi Hypervisor Now Free - VMware)
I could be missing something here, but why would you run a server as dual boot? Normally, severs are always on systems, so a dual boot server seems a bit of a waste?
As per KIA's suggestion, you could install VMware ESXi and run multiple virtualised instances simultaneously. VMware is very sweet. And as per someone else, there is no need to blow away the Linux installation, simply install Windows and reinstall the bootloader (grub normally) using a Linux rescue disk. If you don't have free space into which to install Windows you could use gparted to resize your existing partitions.
Slack seems an unusual choice for a new Linux users (apologies if you're not). I wouldn't worry too much about blowing away the Linux installation (unless there is important data there of course ...). Linux is pretty straightforward to install.
You could always install VMware Server on the Windows installation and 'play around' with Linux that way before deciding to reinstall Linux on the bare metal.