Exchange 2010 not able to uninstall exchange server rules

hi
i have couple of exchange servers i want to remove one at all for format purpose ... when i try to uninstall the server the following errors comes

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Summary: 4 item(s). 2 succeeded, 2 failed.
Elapsed time: 00:00:42


Configuring Prerequisites
Completed

Elapsed Time: 00:00:00


Mailbox Role Prerequisites
Failed

Error:
Uninstall cannot continue. Database 'Public Folders': The public folder database "Public Folders" contains the following offline address books:
\Offline Address List Final
. Before you can delete the public folder database, you must change the OAB distribution method to Web-based distribution.
Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=b6e3b32a-8848-46cb-9567-72288ac15f60

Elapsed Time: 00:00:23


Client Access Role Prerequisites
Completed

Elapsed Time: 00:00:07


Hub Transport Role Prerequisites
Failed

Error:
This computer is configured as a source transport server for 2 connector(s) in the organization. These must be moved or deleted before Setup can continue.
Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=67c28d7f-cf6f-4f9c-b8a0-7e28ed318e2f

Elapsed Time: 00:00:09
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how i can continue the uninstall ????