Exchange 2010 with SharePoint 2003

We are running Exchange 2003 and SharePoint 2003 and are needing to upgrade to Exchange 2010. Upgrading SharePoint to 2010 may not occur for 2 to 3 months after the Exchange upgrade. I have not been able to find any information on this upgrade scenario or possible issues. Microsoft support says it is 100% backward compatible, however I don't have alot of confidence in that answer. What are the gotcha's in this scenario?
J-KentAsked:
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Glen KnightConnect With a Mentor Commented:
OK, to be honest, it makes no difference, the only thing that will not work is the viewing of Exchange Public Folders using the Sharepoint Web Part.

Everything else will work as it does now.
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Glen KnightCommented:
What do you have  "shared" between the 2 systems?
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J-KentAuthor Commented:
There is an in house developer who has created some fairly complex intranet sites used locally and internationally by the company. I know that some sites are mail enabled however I have no insight as to how and how many links have been configured.
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Glen KnightCommented:
You will still be able to view mailboxes and calendars, and email to mail enabled document libraries etc.

The part that won't work is if you use Public Folders as viewable in Sharepoint, because of the way this changes from Exchange 2003 to Exchange 2010 it's no longer supported.
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J-KentAuthor Commented:
The migration planning document clearly discussed migrating public folders from 2003 to 2010. Are you saying that the public folders will exist, but not be viewable by Sharepoint? Pardon my ignorance, but I thought they built in some backward compatibility as in 2007.
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Glen KnightCommented:
>>discussed migrating public folders from 2003 to 2010

You are talking about the exchange document? This is because public folders are deprecated in Exchange 2010 and it's recommended you move them to Sharepoint.

What I am saying is if you use a webpart to view public folders at the moment this will not work on Exchange 2010
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J-KentAuthor Commented:
Ah, good to know. Would you recommend upgrading SharePoint first? This seems to be the typical path.
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Glen KnightCommented:
it won't make any difference, the public folder view doesn't work on the newer versions of Sharepoint either as far as I am aware.
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sabby447Commented:
Let me type down what you have and please correct me if this is right or wrong:

1. Outgoing email : Fairly obvious guess as i can take , Is this using a smtp locally or is it hitting the exchange server smtp connector?
2. Incoming email : Is this configured, If yes how does it read the email
3. Public folder : Yes MS has a article however the support is very limited and hardly i have seen scenario where Public folder is used. You may want to consider moving to sharepoint

What else is integrated between the two ?

Some points to consider:
1. As you are moving to sharepoint 2010 2-3 months down the line then what is your plan of migrating the public folder over to sharepoint if any ? As Public folder is coming to end of life situation in exchange
2. What is your plan of migrating these applications which uses exchange to move to sharepoint document libraries, if the above point is good
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J-KentAuthor Commented:
I am researching for more detail. Unfortunately the developer I mentioned earlier in on vacation.
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J-KentAuthor Commented:
I think that answers the question. There are several links to public folders, however that data is available elsewhere and is to be incorporated in the SharePoint upgrade at a later date. Thanks,
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