Outlok 2003 and OAB/PF

I would like to know why Outlook 2003 and earlier versions rely on Public folders and Offline Address Book.

I believe during installation of Exchange 23010 it asks for the version of outlook used in the organization, if outlook 2003 is used then PF and OAB are mandatory.
Thanks
jskfanAsked:
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ITF1Connect With a Mentor Commented:
Hi,
in echange 2007/2010 the OAB/ Free/Busy and many other things are distributed by EWS (Exchange Web Services) In 2003 the distribution of OAB and Free busy was solely thru Public Folder. If you don't have anymore 2003 clients in you Organization you don't need Public Folder anymore.
Regards
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ITF1Connect With a Mentor Commented:
Beside of that, in case you didn't mark the 2003 clients during installation, just create a public folder DB and Check in you OAB settings that Public Folder and Web Distribution is checked.
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jskfanAuthor Commented:
"Free Busy", is this on Outlook, when you invite users you will be able to see if they have other appointments ??
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Krishnamanoj83Connect With a Mentor Commented:
Hi,

Freebusy means looking other users availabilty from outlook scheduling tab, please find this MS link whcih gives complete details of freebusy generation process
http://blogs.technet.com/b/exchange/archive/2006/08/04/3394674.aspx

Regards,
Krishna
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ITF1Connect With a Mentor Commented:
@jskfan
yes exactly that the difference is that 2003 and previous outlook clients rely on Public Folders and 2007 and later Outlook uses Exchange webservices for "seeing" the information.
Regards
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jskfanAuthor Commented:
Excellent!
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