[cellarius]

Originally Posted by ForceHSS

All files are overwritten, not replaced ie the old ones are not removed. You will also need to update your styles. You might not have to update all plugins

Huh, what's that supposed to mean? Overwriting and replacing means pretty much the same, and of course the old file versions are "removed", i.e. they are no longer on the server. Or do you mean addon files? They are neither overwritten/replaced nor removed, they stay just as they are.

--------------- Added [DATE]1400716851[/DATE] at [TIME]1400716851[/TIME] ---------------

Originally Posted by gajinoz

I only have the default style so no problem there I assume.

So, if any mod I have installed has changed a template there is a possibility that, after an upgrade, that template may have been overwritten and, therefore, the mod won't work.

Have I got that right?

No, because templates are not stored in the file system, they are not files. Your templates stay untouched, but you may have to make adjustments.