Attempted to work offline, got a "cannot connect to server" error... Synced fine, everything on the account made it over. (XPSP3-BTW)

Does one have to have a Yahoo "plus" account to use offline? If so, sorry Zimba, no sale. Other than consolidating various email accounts, it seems like the entire process of using this app is slower than just going to the Yahoo website and checking the mail. Seemed like being able to work offline on a standard acct. was the only unique propostion this app had, and all the press indicates it can do it...

Sorry if I sound grumpy and/or ungrateful, just need to know if I wasted 3 hours setting this thing up?

Thanks in advance.