I have just updated to Mailwasher Pro 2010 on a ThinkPad T400 laptop running Win 7 Ultimate x64.
When I have Mailwasher Pro 2010 maximised, the auto-hidden Win 7 task bar is not accessable at the bottom of the screen. This did not happen with Mailwasher Pro v6.
This is quite annoying, and anti-social in terms of Windows GUI behaviour.