Applies to: Exchange Server 2007 SP3, Exchange Server
2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2008-03-13
Microsoft Exchange Server 2007 includes many improvements to the Exchange database architecture. Specifically, the improvements include the following:
- Volume Shadow Copy Service (VSS) improvements
- Public folders are no longer used for system data
- Added customization opportunities
- Database architecture changes
Volume Shadow Copy Service
Exchange 2007 includes all the VSS features in Exchange Server 2003, and the new ability to restore Exchange data to an alternative location. In Exchange Server 2003, the Exchange VSS Writer component did not enable retargeting VSS restores to a location other than their original path. In Exchange 2007, you can restore VSS backups to alternative locations.
Public Folders No Longer Used for System Data
Exchange 2007 no longer requires the use of public folders for services such as free and busy database and offline address books when using Microsoft Office Outlook Web Access or Office Outlook 2007. Therefore, unless you have a content or application-based need for public folders, you do not have to deploy or maintain a public folder database. If you plan to deploy organizational forms in your organization or if you have Microsoft Office Outlook 2003, you will still need to use public folders.
Added Customization Opportunities
Exchange 2007 enables administrators to customize messages for size limits and quota overages. Exchange 2007 now provides mailbox and message send limitation settings to Outlook Web Access and Microsoft Outlook. Exchange 2007 also lets you customize these messages to make them more meaningful to the user. For example, you can customize the message to include the limits information, such as the user's current send and mailbox size limits and the current size of their mailbox.
Additionally, two other customizations are now possible:
- The 32 KB rules limit has been increased to a default size of
64 KB per mailbox. The rule limit is now a customizable limit of up
to 256 KB per mailbox.
- Exchange 2007 includes MAPI as a protocol that can be
allowed or disallowed on a per-mailbox basis. Earlier versions of
Exchange only allowed administrators to restrict MAPI access at the
Exchange store level. Exchange 2007 enables administrators to
restrict MAPI access at the mailbox level.
Database Architecture Changes
The Exchange database architecture has changed in four significant respects:
- The streaming database (.stm) file has been removed from
- Longer log file names are used, thereby enabling each storage
group to generate as many as 2 billion log files before log file
generation must be reset.
- Transaction log file size has been reduced from 5 MB to 1 MB to
support the new continuous replication features in
- The database page size has increased from 4 KB to 8 KB.