My name is Venera!
I would like to share with one useful plugin for synchronization BaseCamp with MS Outlook! GrabSync.com
GrabSync solution provides a two-way synchronization.
It's easy in work - just install it, login and choose what you would like to sync (which projects, features).
The most that i like is sync messages - just can easily create or edit messages and comments to Basecamp from your Outlook!!
There are also sync milestones, to-dos and ability for import contacts.
I think it's better once to try than talking about.
To learn more and test GrabSync you can here; http://www.grabsync.com