Switched to the Thunderbird mailclient at home a while ago. With the recently released version 0.6 I decided to switch here at work also. But somehow I couldn't save attachments. Couldn't find anything online on how to solve this and reinstalling didn't help either. Luckily the profile manager did the trick. Created a new one and deleted the old one and now it works.

Oh and I'd like to read Defensive Design for the Web by the guys from 37signals.