Using Ubuntu 10.04 LTS:

Release 7.1.1_GA_3196.UBUNTU10_64 UBUNTU10_64 FOSS edition.

Whenever I click on the "Find Shares..." link, in either the Calendar or Mail, nothing happens. It used to open up a box to search, but now shows nothing. It is happening for all users, not just one. I checked the pop-up blockers, and even when completely disabled, the link still does nothing.