GMail and Syncing

I have a 9650, had a Tour before and keep running across this issue over and over. When I put my GMail on my BB, it syncs with the contacts on GMail, no biggy, but then it says I can't sync with Yahoo, so I remove GMail and now when I goto DM, it gives me a error that it won't sync. I am sure this is a known issues and I have search the forums and haven't found the same thing.

Can anyone help? Also, if anyone knows about why I can't get my calendar to sync with Outlook 2010, that would be great too. It says No messages stored.

Chuck