Microsoft has announced the release of Update Rollup 4 for Exchange Server 2010 Service Pack 1.
This update contains a number of customer-reported and internally found issues since the release of RU1. See ‘KB 2509910: Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1′ for more details. In particular we would like to specifically call out the following fixes which are included in this release:
- 2519359 Unable to Create a ‘Reply With’ Rule on Public Folders Even With Owner and Send As Permissions
- 2394554 Generating DSN fails if original mail uses non-support encoding charset.
- 2490134 Outlook 2007 does not deliver “Delayed Delivery” Messages against an Exchange 2010 Server in Online mode with any additional Transport loaded in the Outlook Profile
I also noted this fix that will be important for anyone planning a migration from Exchange 2007 to Exchange 2010 in a very large environment where users are likely to be members of more than 200 security groups.
- 2491354 You cannot view the free/busy information of users in a mixed Exchange Server 2007 and Exchange Server 2010 environment
Deploying Exchange Server 2010 Update Rollup 4
The standard order of deployment for Exchange Server updates applies.
- Client Access servers, starting with the internet-facing ones. See this article for how to patch a CAS array.
- Hub Transport and Edge Transport servers
- Mailbox servers. See this article for how to patch a Database Availability Group.
- Unified Messaging servers
When Microsoft released Update Rollup 3 it had to be withdrawn due to issues it caused for Blackberry customers. At around the same time an update rollup for Exchange 2007 also had to be withdrawn and re-released due to serious bugs. Those incidents shook the confidence of many Exchange customers and administrators so I expect there will be more caution applied for deployment of this latest update rollup.