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Difference between ActiveSync and Outlook Mobile Access

I am having trouble figuring out the difference between ActiveSync and OMA.  Could someone break it down simply for me.  I've already read the MS white papers on the subject and they still don't distinguish the difference between the two very clearly.

Thanks.
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AManoux
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AManoux
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1 Solution
 
redseatechnologiesCommented:
OMA is like OWA (Outlook Web Access) - it is a thin client where you can see your exchange mailbox, you open emails like a new web page.

EAS (Exchange Active Sync) is push email - it works in a similar way to a BlackBerry, in that is PUSHES email at the phone, and you open items as you would an SMS
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AManouxAuthor Commented:
So why would a user need OMA if they already have OWA?  Does it format the web page differently so it is more readible on a mobile device's small screen?

Also, for both OMA or EAS is port 443 the only port that needs to be opened through the firewall?
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redseatechnologiesCommented:
>>Does it format the web page differently so it is more readible on a mobile device's small screen?

Bingo.  OMA is all text, and the right size.

>>Also, for both OMA or EAS is port 443 the only port that needs to be opened through the firewall?

Correct again.  Exchange servers only need 25 and 443, mail and everything else.

-red
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AManouxAuthor Commented:
Thanks. You are much better than Microsoft KB.
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redseatechnologiesCommented:
You are most welcome :)
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