Are Stuffit or StuffitX files not supported by Tiger?

Stuffit is support is no longer included with the OS but you can still download and use Stuffit or the free Expander to work with .sitx files.

Instead, the OS does have built in support for .zip files accessed most directly through the Finder contextual menu.

OS X has never natively supported .sit files.

They must be compressed/decompressed by Stuffit Expander or Drop Stuff...available from Stuffit.com

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That's not true. What is true is that Stuffit is no longer included with Tiger. You can download the free expander program from http://www.allume.com/

The problem is for people who go to download .sit and .sitx files who got Macs post Tiger's release and/or erase and installing Tiger to realize they need to download it from there since it wasn't included with Tiger.

That is incorrect. Stuffit has always been a third party application for the Mac. What did change in Tiger is that Apple no longer includes a copy of the free Stuffit Expander in the installation.

Since that portion is only good for opening Stuffit archives, not creating them, you'd have to purchase either the Standard or Deluxe versions of Stuffit for each Mac in your shop.

So what IT really means is that they don't want to pay for all of the licenses necessary to put Stuffit on your Macs when you can use the built in Zip format for free.

To handle those cases where a client does send you a .sit or .sitx file, you can download the free Stuffit Expander from Allume's web site.

Edit: Heh! Lots of folks dropped in an answer to this question at the same time. 🙂