user not started because of error 8004011d for Blackberries

I had a BES Express box sitting on an Exchange 2010 box, but my users weren't receiving email. The event logs showed "user not started." After stopping and restarting the services in the proper order, my next step in troubleshooting was to run IEMStest.exe from a DOS prompt. Here were my results:

C:\Program Files (x86)\Research In Motion\BlackBerry Enterprise Server\Utility>IEMSTest.exe
BlackBerry Enterprise Server Utility - IEMSTest.exe (IExchangeManageStore), Version 1.0
Copyright (c) Research In Motion, Ltd. 1999. All rights reserved.
Opening Default Message Store Mailbox - BESAdmin

Eric Jones: Opening message store using
/o=First Organization/ou=first administrative group/cn=Recipients/cn=Eric
/o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)
/cn=Configuration/cn=Servers/cn=server2/cn=Microsoft Private MDB
Eric Jones: OpenMsgStore failed (8004011d)
Eric Jones: CDO Server Name: server2
Eric Jones: CDO Mailbox DN: /o=First Organization/ou=first administrative grou
p/cn=Recipients/cn=Eric
Eric Jones: CDO logon successful
Eric Jones: Get default calendar folder successful
Eric Jones: Get calendar folder name successful: 'Calendar'
Eric Jones: CDO test completed successfully
Eric Jones: Active Directory permissions test completed successfully


As per the above output, the mailbox was not opened with error 8004011d. I ended up following these steps to adjust the throttling policy, which fixed the issue. After making the changes, I restarted the BB services and the Exchange services, and then the IEMStest passed and the mailboxes were accessible again.