Lotus domino upgradation from ver.5.0.8 to Ver 6#

HI,

We are going to upgrade the lotus notes Servers and clients.

Currently we are using Lotus notes client version 5.0.8.There are around 1000 employee in my Company ,so it would be very tough to go and upgrade\install notes client ver 6#.

I just want to check the available options that can save my time.Like if i can have some Exe file that can be send to users by mail and they can upgrade the version(5 to 6) by them self.

Or if i can write some batch file.

I will highly appreciate if some one can give me the best solution for this.

Thanks in Advance

Happy