It's ugly and messy. I'll try.

1. Either go into red pill mode in Application manager or use "apt-get remove" as root. Remove the following packages (some may get removed when others are removed also):

• modest
• libtinymailui-gtk-1.0-0
• libtinymailui-1.0-0
• libtinymail-maemo-1.0-0 (removed with libtinymailui-gtk-1.0-0)
• libtinymail-gnomevfs-1.0-0
• libtinymail-1.0-0
• libtinymail-camel-1.0-0 (removed with libtinymail-1.0-0)

2. I think you need to be in red pill mode for this. Go to the modest repository with your web browser, or, probably easier, use the links in the list below. If you use the repo, you need to install the Feb. 29th version of the following packages (click on the link and use "open"), and I think they need to be in this order. If a package insists on one of the other ones as a dependency, just install the dependency first.

• libtinymail-1.0-0_1.0.0-svn3438_armel.deb
• libtinymail-camel-1.0-0_1.0.0-svn3438_armel.deb
• libtinymail-gnomevfs-1.0-0_1.0.0-svn3438_armel.deb
• libtinymailui-1.0-0_1.0.0-svn3438_armel.deb
• libtinymailui-gtk-1.0-0_1.0.0-svn3438_armel.deb
• libtinymail-maemo-1.0-0_1.0.0-svn3438_armel.deb
• modest_1.0-2008.10-1_armel.deb

If someone finds a problem with my instructions, my links or the install order, please tell me.

This will probably be obsoleted soon, when they release a fixed version. But if you can't wait for the update...