From 6.3 restore
This site accepts full site imports from Confluence 4.0 and later, and space imports from Confluence 5.3 and later.
Well, you can try it - a space export can work when imported on a much later version.
The official way to do it, which will work, is to take a copy of your 4.2 system (or just the space), stick it into a dev system on 4.2, upgrade it to 6.3, then export from there and you'll be able to get it into the 6.3 production.
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