Planning for Large Mailboxes with Exchange.docx

1、Planning for Large Mailboxes with ExchangeWhite Paper: Planning for Large Mailboxes with Exchange 2007Topic Last Modified: 2009-01-22 Tom Di Nardo, Senior Technical Writer, Microsoft Exchange ServerJuly 2008Summary This white paper provides an overview of the benefits of deploying large mailboxes wi

2、th Microsoft ExchangeServer2007.It also providesplanning guidance to help you successfully implement the deployment of large mailboxes.Note: To print this white paper, click Printer Friendly Version in the Web browser. Applies to: MicrosoftExchangeServer2007Table of Contents Introduction Benefits of

3、 Large Mailboxes Benefits for Users Benefits for Administrators Leveraging Exchange 2007 Features to Address Challenges Performance and Scalability Storage Considerations for Maximum Mailbox Size Outlook Online Mode vs. Cached Mode Client Usability and Mailbox Management Client Throttling Rapid Disa

4、ster Recovery with Large Databases and Multiple Databases Operations Management Conclusion Additional Information Introduction The volume of e-mail that users receive on a daily basis continues to increase. Concurrent with this increase in the number of e-mail messages that users receive, the size o

5、f the average e-mail message also continues to increase. With the increase in both the size and number of e-mail messages that users receive, the amount of time that knowledge workers must spend managing this increasing amount of e-mail is significant. As users spend more time trying to keep their m

6、ailbox organized, their overall productivity is reduced. Additionally, because users are forced to spend this time managing e-mail to stay under low quotas, these users become increasingly frustrated with the inability of their Information Technology (IT) departments within their organizations to of

7、fer mailbox sizes that match or exceed the mailbox sizes offered by the providers of their personal e-mail accounts. This user frustration can pose a significant threat to corporate intellectual property, as well as regulatory compliance, if users move their corporate e-mail to online web-based e-ma

8、il as their primary business e-mail (which has greater than 1 gigabyte mailbox limits).Earlier versions of Exchange did not scale well enough, at a low enough cost per mailbox (because of expensive hardware and recovery options) to allow IT administrators the ability to match the ever increasing mai

9、lbox sizes of personal e-mail accounts. Exchange2007 offers dramatic performance and scalability improvements when compared to prior versions ofExchange. Long recovery times have been a significant impediment to the adoption of larger mailbox sizes. The introduction of cluster continuous replication

10、 (CCR) offers the ability to rapidly recover from outages at a low cost. These performance and rapid recovery improvements enable IT departments to deploy large mailboxes easily and at a low cost. Increased mailbox sizes improve end-user productivity and satisfaction, reduce IT administrative costs,

11、 improve security, and help meet business and regulatory compliance requirements.Note: The phrase large mailbox can mean different things to different people. In this white paper, large mailboxes are defined as being larger than 1 gigabyte (GB) in total size. Return to top Benefits of Large Mailboxe

12、s Deploying large mailboxes with Exchange2007 offers significant benefits for both the end user and the IT administrator.Benefits for UsersWhen you deploy large mailboxes with Exchange2007, in most cases users can have access to a year or more of their e-mail, voice mail, and fax messages natively f

13、rom either MicrosoftOfficeOutlook2007Service Pack 1 (SP1) or the version of OutlookWebAccess that is included with Exchange2007. Consider the following benefits that users can leverage by maintaining mail in their Exchangemailbox: Improved access to Exchange information from anywhere and from any de

14、viceBy retaining mail in the users mailbox, a seamless experience can be maintained for accessing data that would previously have been moved to .pst files, archived via a third-party archiving solution, or deleted to stay under a storage quota. By retaining this data in Exchange, users can leverage

15、WindowsMobile powered devices, Outlook2007, and OutlookWebAccess to easily access and act on this data from anywhere. Improved searchThere have been significant improvements to the search functionality offered with Exchange2007 and Outlook2007. Additionally, users with Windows Mobile 6 devices now h

16、ave the ability to search their entire mailbox. Users who must search in .pst file archives and third-party archiving solutions must perform the same search multiple times.Although Windows Desktop Search works well to improve search capability on .pst files, this is only useful at a users primary wo

17、rkstation. By retaining more mail in a users inbox, the improvements in content indexing and search with Exchange2007can be leveraged by any client, making rapid discovery of user information possible. Reduced mailbox managementBy allowing users to have large mailboxes, they are able to spend less t

18、ime managing their mailboxes to clean up old items. Increased productivity for remote workersHaving Exchange-based access to more e-mail data allows remote workers to securely access their Exchangedata from Internet kiosks, computers at remote client locations, their Windows Mobile 6 devices, and fr

19、om home. When e-mail data is stored in a secure location (Exchange) and is accessed in a secure fashion (OutlookWebAccess, Outlook Anywhere, and Windows Mobile), security risks inherent in storing information in non-IT managed locations arereduced. Eliminated .pst filesFrom an end-user perspective,

20、the ability to live without .pst files offers a significant increase in the usability of the e-mail system. Users no longer need to concern themselves with having to regularly purge e-mail from their mailboxes to stay under low storage quota limits. There is no longer the risk that critical e-mail s

21、tored in a .pst file will be lost due to corruption of the .pst file or a disk failure. Elimination of .pst files also ensures that client performance issues due to accessing .pst files over the network are removed. Traveling workers will no longer be unable to retrieve a critical e-mail from a .pst

22、 file that is stored on their desktops. Additionally, traveling workers no longer need to worry about e-mail data loss if their portable computer is lost or stolen. Eliminated third-party archiving stub filesThe primary end-user benefit of eliminating stub files when using third-party archiving solu

23、tions is providing a consistent mailbox experience from multiple clients (including Windows Mobile). The deployment and management of additional third-party Outlookadd-ins are required to make the use of stub solutions work with Outlook. Althoughsome solutions offer access to the archive through Out

24、lookWebAccess, none of those solutions offer Windows Mobile device access.In most cases, stub file item size is from 10 to15 kilobytes (KB). The amount of usable data contained in a stub file of that size is minimal,usually a few paragraphs or less. Some of the archival solution providers recommend

25、a stub file size from 1 to 2 KB, which only contains the message header information. If you are retaining a few months of stub files, the number of search hits to review them is relatively low.Therefore,locating the desired message without having to make too many searches throughthe archive is reali

26、stic. However, if several hundred thousand messages are retained, the probability of successfully locating aspecific message is challenging when you donot have a significant portion of the message body available. As a result, users probably need to go to the archive multiple times andretrieve many m

27、essages to find the desired message. Third-party archiving solutions solve the problem of supporting mailboxes that cannot be bound by size limits and regulatory compliance requirements for archival of all e-mail traffic. However, when deployed, these solutions should be configured to move the e-mai

28、l content out of the mailbox without retaining stub files in the mailbox.Return to top Benefits for AdministratorsBy designing an environment to support large mailboxes with Exchange2007, administrators take steps to reduce costs and improve IT department agility. Deploying large mailboxes with Exch

29、ange2007 offers the following benefits to administrators: Positions IT for high availability and rapid recoveryHigh availability and disaster recovery have been complex areas in earlier versions of Exchange. The Exchange2007CCR feature easily allows administrators to offer a high availability soluti

30、on to their organization while also moving away from time consuming and complex recovery procedures. CCR offers asynchronous replication of a backup copy of the production data that can be rapidly enabled should a failure of the production server occur. When CCR is deployed, standard recovery times

31、as fast as two minutes are now possible. Positions IT to reduce or eliminate .pst usageBecause .pst files are not generally managed by IT pros, these files are located ultimately on knowledge workers portable computers, desktops, or file shares; or even in public folders. The .pst files can become a

32、 significant burden to organizations by impacting server and network performance, reducing usability, and increasing support costs. Generally, .pst files are not backed up, thereby increasing the risk of data loss. Microsoft does not support access to .pst files over networks. A large percentage of knowledge worker performance issues involve accessing .pst files stored on files servers. Additionally, because .pst files are inherently portable, they pose a data security ris