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Exchange Server 2007 Update Rollup 4 is Available

Update Rollup 4 for Exchange Server 2007 (KB 940006) has been officially released at the end of August 2007. The update is live at THIS LINK, and will also be offered through Microsoft Update.
To read more about Update Rollup 4 please see KB 940006.
Download the 32-bit version (30.1 mb)
Download the 64-bit version (33.6 mb)
Here is a list of escalated issues fixed in Update Rollup 4:

930463 – Missing Recipients on Edge cause 5.1.1 NDR, Edgesync does not Sync objects from Other domain trees in Same Forest
937656 – Change to DST transition dates in New Zealand time zone starting 2007
936300 – Mailbox Moves Blocked due to store deadlock
Dismount Fails When Run As Local System
Cancelling a backup from replica writer leaves store in backup in progress state, store restart is required in order to continue the backups successfully
932561 – Implement Western Australia DST time zone
Test-edgesync needs to compute proxyaddress hash only once to avoid false positive in multi-edge server scenario
937861 – Exchange Gives Borked Address Type Array to Client, Causing NDR
938359 – Store.exe crash while composing a standard reply for moderated email-enabled public folder
938698 – LLRPerf: Long running open transactions are causing the checkpoint adv to be tricked into thinking it needs to version pages
936716 – Date format in body of read receipt confirmation does not match OS regional settings
940052 – Unable to reconnect a mailbox through EMC
933314 – ADSizelimitExceededException when GetDefaultAcceptedDomain() is called
939560 – EcGetSTF will only return maxPageSize number of OABs, not enough for hosting systems

As with previous Update Rollups, this is a cumulative patch and it replaces the need to install previous Update Rollups:

KB930809 Update Rollup 1 for Exchange Server 2007
KB935490 Update Rollup 2 for Exchange Server 2007
KB935999 Update Rollup 3 for Exchange Server 2007

Up to this point, no known issues exist with this rollup, so for now, it looks like it’s a safe installation on production servers. As always, make sure you’ve got a working backup BEFORE installing any patch on your servers.
Note: 32-bit editions of Windows Server 2003 SP1, Windows Server 2003 SP2, Windows Server 2003 R2, and Windows XP SP2 are only supported for Exchange Server 2007 management tools.