Have two installations of ZDC 2.0 (b10580): one - on W7, another - on XP. Got same problem - cannot compose any email message - no response on clicking "Compose", "Reply" or "Forward".

But I can schedule a meeting or add task...

... mmm, common things - switched to russian interface right after installation finish (during zbox sync process).

Any suggestions?

Sencerelly, AzZ.