Confused About BES Capabilities

OK, I'm coming from a Windows Mobile phone using active-sync to sync up my Outlook account hosted by ExchangeMyMail.com. Got rid of the Windows Mobil phone and now have a BB Curve. Initially I just has BIS, but didn't like that if I deleted mail from my outlook account on my PC, the mail would still show up on my BB as unread. So I added BES to my Sprint account, added BB sync on my Exchange account, but if I delete an e-mail on my PC, it doesn't delete on my BB. On my BB for e-mail reconciliation I have it set to 'Mailbox & Handheld'. Am I expecting too much?

Also, should 'Tasks' for my exchange account sync with the BB Tasks?