When do you think Tiger will be obsolete

An we have to upgrade to Leopard. Cause the reason why I ask is, because i have heard that there are some problems and I dont want have to upgrade because of industry standard.

Tiger won't be obsolete for some time yet.

That is a personal call. Tiger will be obsolete the moment you want to load some new program, or upgrade an existing one, where Leopard is a dependency. Until then, Tiger will be just fine. My guess? 1-2 years. I don't think you will see vendors drop backward compatibility to Tiger for some time to come. There are simply too many copies out there. They would be severely limiting their addressable market.

"Obsolete" (def: no longer in use; fallen into disuse) is an over-used, often misunderstood word.

Tiger (or any software or hardware for that matter) will only become obsolete when it can no longer provide you with your daily computing needs.

Example:
I work in Graphic Design. I have both the Adobe CS2 and CS3 suites.
I generally use the CS2 apps more often and rarely ever open the CS3 ones.
So, CS2 is not obsolete just because a newer version is out. I still use it every day, where I only use CS3 maybe every other week.

I agree with the above.

I would deem it to be obsolete when your current machine can not run it in any capacity for any reason. For example, since Apple pulled Classic support from 10.5 and my Quad can not native boot it, AFAIAC OS9 or below are now "obsolete" for me on this machine.

Since my iBook can sill boot OS9, it is not "obsolete" on that machine.

Perhaps you could compare tiger to Windows Me going to Windows Xp and so on. Just like everyone else, I predict it will take perhaps 2 or so years ~ ish.

Security updates will probably cease once 10.6 ships. But the bugs in Leopard should be fixed long before then. (In fact, they may be fixed in the 10.5.1 update that just came out.)