InDesign CS version 3.0 updating to 3.01 patch

Question

When updating my Indesign CS version 3.0 with the 3.01 patch, it says update was installed successfully, but it doesn't update to 3.01. Will it say 3.01 in "About InDesign"? Still says 3.0. Also, when I run update installer check it still says 3.01 update is available to update.

Answer 1

Backward compatibility in Indesign works like this:
Any version of ID can open files from any version up to that release. Once saved in a newer version, files cannot be opened in older versions, with the following exception, of sorts. Beginning with CS2 (version 4) files can be exported to .inx (Interchange Format) which can be opened by the version doing the export and one version earlier. Any features used in the newer version which are not available in the older version will be lost, and text will most likley recompose and change line ending points due to differences in text engines for each version. It is possible to hack CS4 .inx to sometimes make it open in CS2, but it is not guaranteed.
Exporting to back save is not a recommended workflow and should be considered a last resort. If you know a file will need to be opened in an earlier version, you should do all work in that version for best results.