I just got the Samsung Captivate and I have a few questions, if you could please help me... 1. I am unable to open MS Office files and pdf. Do I have to download an app to be able to open them? If so, what apps do you recommend. 2. I heard the Droid can do voice guided navigation. Can the Samsung Captivate do this as well or do I need to download an app? I can't seem to find the voice guided navigation on Maps. 3. I tried to add my Yahoo! email, but it kept saying invalid username and password. I googled about it and I read that you have to disable wi-fi. Is there a way around it? It's kinda hard to keep disabling wi-fi and enable again for other things that I want to do. Thank you in advance!