We currently have VB installed at domain.co.uk/forums with vbadvanced at domain.co.uk.
We'll be installing XF at domain.co.uk.
How I plan to do it at the minute is just to tar and move everything at domain.co.uk to a sub domain (vb.domain.co.uk) and then install XF.
However this will lead to quite a bit if downtime as all the style edits will need making and then the import can take something like 10 hours.
Would it be easier to get XF installed in a sub domain, get it ready and then move it across to it's final domain afterwards? Are there any problems doing it that way?