Send As, Blackberries and Confusion

I've read two documents regarding Exchange 2003 permissions to assign
to the BESAdmin account.

From RIM : KB02276 from blackberry.com.
http://www.blackberry.com/btsc/search.do?cmd=displayKC&docType=kc&externalId=KB02276&sliceId=SAL_Public&dialogID=3648547&stateId=0%200%202741334

From Microsoft : KB912918 - Users cannot send e-mail messages from a
mobile device or from a shared mailbox in Exchange 2000 Server and in
Exchange Server 2003.
http://support.microsoft.com/kb/912918/en-us

1. RIM tells me (In task 4) to give permissions at the Exchange server
level. Microsoft tells me to give permissions at the Exchange server
level and on every mailbox stores. Can someone explain to me why
microsoft suggest to give both permissions?

2. RIM tells me to (In task 5) to give Send As permissions to users
objects in AD.
Microsoft tells me to give Send As and Receive As permissions on users
object in AD. Are the Receive As permisssions necessary on the AD user
object?

Thanks in advance for clearing up my confusion.

.

Relevant Pages

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