Update Rollup 4 for Exchange Server 2010 RTM (KB 982639) is now available to download and install.
KB 982639 lists all the fixes included in this rollup. Here are some of the product improvements and critical bug fixes.
Here are the few of fixes, I would like to highlight as Exchange Developer perspective:
KB 982639 has more details about this release and a complete list of all fixes included in this worthwhile rollup.
To download and to install Update Rollup 4 for Exchange Server 2010 RTM, visit the following Microsoft Update Website: http://update.microsoft.com
Note Microsoft Update does not detect Update rollups on Exchange Server 2010 Mailbox servers that are part of a database availability group (DAG). You may want to deploy Update Rollup 4 for Exchange Server 2010 RTM to multiple computers that are running Exchange Server 2010 RTM. Or, you may want to deploy Update Rollup 4 for Exchange Server 2010 RTM to Mailbox servers that are part of a database availability group (DAG). The update rollup is also available from the Microsoft Download Center. The following file is available for download from the Microsoft Download Center: Download the Exchange2010-KB982639-EN-x64 package now.
Service Pack 3 is now available to download for the Microsoft Exchange Server 2007. With this service pack now we can install Exchange Server 2007 on the Windows Server 2008 R2.
We can download Exchange 2007 SP3 here.
For an overview of the new features that are available in Exchange Server 2007 SP3, see "What's New in Exchange Server 2007 SP3".
Additionally, Exchange 2007 SP3 includes all the updates that are included in Update Rollup 4 and earlier for Exchange 2007 SP2. For more information, see Microsoft Knowledge Base article 981383, Description of Update Rollup 4 for Exchange Server 2007 Service Pack 2.
For a list of schema changes that are made by Exchange 2007 SP3, see Active Directory Schema Changes (SP3).
If you need to manage .pst files in users’ Outlook profiles. to help automate these activities related to .pst files, sample tools are now available for download and use from the Microsoft Download site.
The Getpst.exe tool allows you retrieve information about the existing services (PST files) in a given e-mail profile. It is possible to retrieve information about all ANSI PST files, all UNICODE PST files, or both file types.
The Addpst.exe tool allows you to add PST services (PST files) to a given e-mail profile. You can add either new or existing PST files to the profile. The file will be created at the specified file location. The PST file can be either in ANSI format (Outlook 97-2002 Personal Folders File) or UNICODE format (Office Outlook Personal Folders File).
The Delpst.exe tool allows you remove services (PST files) from a given email profile. It is possible to remove all ANSI files, all UNICODE PST files, or all files of both types. This tool cannot be used to remove individually specified .pst files from a profile.
These tools use extended MAPI as this is the only supported way to programmatically change MAPI profiles. For additional information, please see the following article in the Microsoft Knowledge Base. 266352 INFO: MAPI Is the Only Way to Programmatically Change Profiles
We would also require to install prerequisite to run the all of above tools. We can refer to the following article for further information and usage of the tools: Outlook Tools: description of sample tools for managing PST files in your Outlook Profile
Hope this helps!!!