Mail through Comcast exhange perfect on iPhone and iPad but intermittent problems on MacBook Pro?

I run on an exchange server through Comcast. My exchange mail works perfectly on my iPhone and iPad but doesn't work properly most of the time on my MacBook Pro.  My MacBook is not that old. This happened with Snow Leopard. I just updated to Lion and it's happening with Lion too. It's happening with iCal, Contacts and Outlook too. Any ideas why it's working fine on iPhone and iPad but problems on the MacBook Pro? This is very frustrating. I'm having to respond to emails on my iPad when I'm right next to my laptop. Gmail emails work fine with laptop. Seems to be a problem with my MacBook and exchange server. Thank you.

Hello Ingi,
Thank you for using Apple Support Communities. 
You can use the following article to troubleshoot your Apple TV, look at the section "Resolve network or streaming issues" for Airplay.
Apple TV: Basic troubleshooting
Regards,
Jeff D. 

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