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.

Snow Leopard was originally scheduled to be released in September. The upgrade includes some minor features, including better support for Microsoft Exchange, as well as a number of less visible improvements to the operating system, such as a rudimentary anti-malware program and native 64-bit support.

PGP is not the only developer to miss supporting the Snow Leopard update. Apple's list of affected software includes Symantec's Norton antivirus (Symantec is the owner of SecurityFocus), Agile Software's 1Password password vault, and older versions of the popular Parallels virtual machine software. The latest version, Parallels 4, is compatible, according to the company.


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