Running LR3.3 - can I delete catalog previews from older versions?

I've got three folders on my HD with names like Lightroom 2 catalog previews.lrdata, Lightroom 3 Catalog Previews -2.lrdata and Lightroom 3 Catalog Previews -3.lrdata ... are all three necessary or can I delete the first two (I'm assuming that Lightroom 3 Catalog Previews -2.lrdata is from the version previous to 3.3)? Just trying to determine what's actually necessary to back up since my external drive's running out of space

You can delete any of the previews folders you like with the understanding that LR will rebuild previews, again, for folders you visit in LR, which is less likely for older versions.
You might also check your back folders and thin out (delete in Explorer/Finder) the older periodic backups to one each month or quarter or year instead of one each week the older they are.

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I tried your procedure. Organizer began a lengthy search, and did not list the missing files. It seemed to me Organizer was attempting to locate physical files that are referenced (included) somewhere in the Catalog, but whose location it no longer knows. (I think these are the ones that Organizer displays with a "?" in the corner of the image.) It's as though Organizer seems to think the files I deleted in Folder B are actually not missing, even though they really are.
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needshelp37 wrote:
However, since Mavericks is free, are you allowed to go from say 10.7 to 10.9, skipping the fee for 10.8?
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HT1808
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Running LR3.3 - can I delete catalog previews from older versions?

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