How to deal with packages that only in an old release?

[Armnotstrong <zhaoxmustc@gmail.com>]

Hi,everyone

Recently I'm trying to synchronize my  wm6.1 mobile-phone with debian
squeeze ,I found a project named "synce"can help me do this, so I
followed the guide for debian lenny on the website of the project
(http://www.synce.org/moin/SynceInstallation/Debian), but I can't find
some packages named "opensync-plugin-evolution,opensync-plugin-synce
multisync-tools" in the squeeze's source,but I can find them in
lenny's source when search the packages on packages.debian.org.
So what I want to ask are:
                                           1)Are they removed or
replaced by some other packages?
                                           2)Can I just download them
from http://packages.debian.org and install them?
                                           3) And by the way,how can I
know a package is removed or replaced by another package?

Thank you
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Best regards