I just got Exchange 2007 running in my test lab and I just created my service account BESAdmin.

I gave the service account the Send As permission within AD applied onto the users objects.

I then give my service account a mailbox in Exchange 2007.

I was able to give the service account Exchange View only Admin with the following command in the power shell:

add-exchangeadministrator BESAdmin -role ViewOnlyAdmin

I was then able to give it Send As, Receive As and Administer Information Store with the following command in the power shell:

Get-mailboxserver JED-DC | add-adpermission –user BESAdmin -accessrights GenericRead, GenericWrite -extendedrights Send-As, Receive-As, ms-Exch-Store-Admin

Where JED-DC is the Exchange/DC server.

I will be installing the 4.1.2 BES tomorrow night. I will update the post when I get it setup.

Ok I got my BES Installed and I added my frist user.

EA'ed the users -> No issues

Sending a message from the Handheld:

[40700] (02/01 00:12:26.428):{0x4A0} {test@myDomain.com} Receiving packet from device, size=131, TransactionId=720661315, Tag=30, content type=CMIME, cmd=0x3
[40292] (02/01 00:12:26.509):{0x4A0} {test@myDomain.com} Email message sent for device, Tag=30
[40279] (02/01 00:12:26.509):{0x4A0} {test@myDomain.com} SubmitToRelaySendQ, Tag=30
[40000] (02/01 00:12:26.509):{0x1164} [BIPP] Send status DATA_ACCEPTED, Tag=30

Success

Mail coming into the handheld:
[30081] (02/01 00:12:28.261):{0x4A0} {test@myDomain.com} Sending message to device, size=166, EntryId=79, RefId=-806894533, TransactionId=-977177364, Tag=34
[30097] (02/01 00:12:28.422):{0x4A0} {test@myDomain.com} Message has been delivered to device, Tag=34, EntryId=79

It looks like mail flow is working both ways.

I will be doing some more testing later.