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Practical experience with Exchange 2010 / Outlook 2003 or less

Preparing to upgrade to Exchange 2010.  I understand the issues with Outlook 2003 with response time, needing to run in Cached Mode, etc...   I'm looking for feedback as to your practical experiences running this way, with Outlook 2003/XP.    In my perfect world, I'd upgrade everyone to 2007/2010, but for a number of reasons ($, foreign plant), not able to do this before the upgrade.  Thanks for your contribution!
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hoosierfan12
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hoosierfan12
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Outlook XP/2002 is not supported:  http://technet.microsoft.com/en-us/library/bb125239(EXCHG.140).aspx

For Outlook 2003 you need to setup Encryption between Outlook and Exchange 2010 in order for this to work.   Or disable the encryption Exchange 2010 which I would not do...

http://www.howexchangeworks.com/2009/09/cant-connect-outlook-2003-to-exchange.html
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hoosierfan12Author Commented:
Thanks for the quick response!

The data encryption is checked by default, so we're good there.

I am aware of what is not "supported".  I'm also aware that many businesses use software configurations that are not officially "supported", but run those configs with success.  I'm looking for anyone who is working these configs and what they are/have experienced (ie. in 2003, response is slow even though we Cache; XP only works if...; 2000 we use OWA/doesn't work at all; etc...)
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
I have only used Outlook 2003 and up with Exchange 2010.    It works without issue.. I have not used Outlook 2002 with 2010 and thought it would not work.   But it appears I'm wrong:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_24789500.html
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hoosierfan12Author Commented:
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