Few queries from Mac user

Few queries from Mac user

I would like to pose some queries to understand if embracing zoho full fledged is the right thing to do?

1> Can zoho calendar sync with iCal(Mac's calendar app)

2> If my company name is ABC then is there some customization where the domain name will be same as ABC else
     ABC@zoho.com should be a good solution and do other companies do this.( Is it advisable from a business point of
        view)

 3> Adding on to Point 2 above, or is it better to sync my company's webmail with my zoho account.

4> Can we use Zoho's wiki offline .Is there a wiki  engine I can download .


--Abhishek