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Of course you can upgrade. But you have to purchase the 10.5 DVD, and after you install it, you will probably want to update that to 10.5.8. The update from 10.5 to 10.5.8 is free and is available from Apple. The trick is in how you perform the upgrade to 10.5 WITHOUT LOSING YOUR EXISTING...

Thank you so much. That is indeed very helpful and re-assuring. Needless to say, I will back up my entire disk to an external drive before I proceed. Best regards, iSeek

Even though this is a very old thrread, I am new to OS X, and wanted to aska question about the side effect of upgrading from Tiger to Leopard. As suggested, I will use the Archive & Install way of upgrading. However, I am not sure if this will preserve all my third party software I have...