Lightroom - do I need to uninstall older versions?

if I have photoshop lightroom 4.3 installed, do I have to uninstall lightroom 2.7
Message was edited by: Victoria Bampton - title changed to make it more descriptive

No, you don't have to.
Both versions can co-exist on your computer.
But keep in mind that Lr 4.3 updates the catalog created by Lr 2.7 (in fact it creates a copy of the catalog and updates the copy). Lr 2.7 is not able to read the Lr 4 updated catalog.
If you try to open it with Lr 2.7 you will get a message saying that this "catalog is too new".
Because Lr 2.7 cannot read the Lr 4 catalog I would recommend that henceforth you do your editing in Lr 4.3 only and use Lr 2.7 only to check things out (Lr 4 is quite a bit different than older versions).
If you would edit in both versions you would get two ever more diverging catalogs.

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