Apple unveiled the latest update to its Mac OS X operating system on Friday, an early release that caught many software makers, including some significant security vendors, behind in their development schedule.
Data-security firm PGP announced on Thursday that the incompatibility of its encryption offering would prevent its users from installing Mac OS X 10.6, also known as Snow Leopard. The software company advised users that, if they wanted to update, they would have to uninstall their PGP products and decrypt any encrypted disks before installing Snow Leopard.

"While we are working diligently to complete the Snow Leopard compatible versions of the PGP Desktop products, we do not recommend you use the currently shipping versions on any system that has been upgraded to Snow Leopard," the company said in a statement posted to its Web site.

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