Planning for Large Mailboxes with ExchangeWord文档格式.docx

Planning for Large Mailboxes with ExchangeWord文档格式.docx

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Server 

2007. 

Italsoprovides 

planningguidancetohelpyousuccessfullyimplementthedeploymentoflargemailboxes.

Note:

Toprintthiswhitepaper,clickPrinterFriendlyVersionintheWebbrowser.

Appliesto:

Microsoft 

Exchange 

2007

TableofContents

∙Introduction

∙BenefitsofLargeMailboxes

∙BenefitsforUsers

∙BenefitsforAdministrators

∙LeveragingExchange2007FeaturestoAddressChallenges

∙PerformanceandScalability

∙StorageConsiderationsforMaximumMailboxSize

∙OutlookOnlineModevs.CachedMode

∙ClientUsabilityandMailboxManagement

∙ClientThrottling

∙RapidDisasterRecoverywithLargeDatabasesandMultipleDatabases

∙OperationsManagement

∙Conclusion

∙AdditionalInformation

Introduction

Thevolumeofe-mailthatusersreceiveonadailybasiscontinuestoincrease.Concurrentwiththisincreaseinthenumberofe-mailmessagesthatusersreceive,thesizeoftheaveragee-mailmessagealsocontinuestoincrease.Withtheincreaseinboththesizeandnumberofe-mailmessagesthatusersreceive,theamountoftimethatknowledgeworkersmustspendmanagingthisincreasingamountofe-mailissignificant.Asusersspendmoretimetryingtokeeptheirmailboxorganized,theiroverallproductivityisreduced.Additionally,becauseusersareforcedtospendthistimemanaginge-mailtostayunderlowquotas,theseusersbecomeincreasinglyfrustratedwiththeinabilityoftheirInformationTechnology（IT）departmentswithintheirorganizationstooffermailboxsizesthatmatchorexceedthemailboxsizesofferedbytheprovidersoftheirpersonale-mailaccounts.Thisuserfrustrationcanposeasignificantthreattocorporateintellectualproperty,aswellasregulatorycompliance,ifusersmovetheircorporatee-mailtoonlineweb-basede-mailastheirprimarybusinesse-mail（whichhasgreaterthan1gigabytemailboxlimits）.

EarlierversionsofExchangedidnotscalewellenough,atalowenoughcostpermailbox（becauseofexpensivehardwareandrecoveryoptions）toallowITadministratorstheabilitytomatchtheeverincreasingmailboxsizesofpersonale-mailaccounts.Exchange 

2007offersdramaticperformanceandscalabilityimprovementswhencomparedtopriorversionsof 

Exchange.Longrecoverytimeshavebeenasignificantimpedimenttotheadoptionoflargermailboxsizes.Theintroductionofclustercontinuousreplication（CCR）offerstheabilitytorapidlyrecoverfromoutagesatalowcost.TheseperformanceandrapidrecoveryimprovementsenableITdepartmentstodeploylargemailboxeseasilyandatalowcost.Increasedmailboxsizesimproveend-userproductivityandsatisfaction,reduceITadministrativecosts,improvesecurity,andhelpmeetbusinessandregulatorycompliancerequirements.

Thephraselargemailboxcanmeandifferentthingstodifferentpeople.Inthiswhitepaper,largemailboxesaredefinedasbeinglargerthan1gigabyte（GB）intotalsize.

Returntotop

BenefitsofLargeMailboxes

DeployinglargemailboxeswithExchange 

2007offerssignificantbenefitsforboththeenduserandtheITadministrator.

BenefitsforUsers

WhenyoudeploylargemailboxeswithExchange 

2007,inmostcasesuserscanhaveaccesstoayearormoreoftheire-mail,voicemail,andfaxmessagesnativelyfromeitherMicrosoft 

Office 

Outlook 

2007 

ServicePack1（SP1）ortheversionofOutlook 

Web 

AccessthatisincludedwithExchange 

2007.ConsiderthefollowingbenefitsthatuserscanleveragebymaintainingmailintheirExchange 

mailbox:

∙ImprovedaccesstoExchangeinformationfromanywhereandfromanydevice 

Byretainingmailintheuser'

smailbox,aseamlessexperiencecanbemaintainedforaccessingdatathatwouldpreviouslyhavebeenmovedto.pstfiles,archivedviaathird-partyarchivingsolution,ordeletedtostayunderastoragequota.ByretainingthisdatainExchange,userscanleverageWindows 

Mobilepowereddevices,Outlook 

2007,andOutlook 

Accesstoeasilyaccessandactonthisdatafromanywhere.

∙Improvedsearch 

TherehavebeensignificantimprovementstothesearchfunctionalityofferedwithExchange 

2007andOutlook 

2007.Additionally,userswithWindowsMobile6devicesnowhavetheabilitytosearchtheirentiremailbox.Userswhomustsearchin.pstfilearchivesandthird-partyarchivingsolutionsmustperformthesamesearchmultipletimes. 

AlthoughWindowsDesktopSearchworkswelltoimprovesearchcapabilityon.pstfiles,thisisonlyusefulatauser'

sprimaryworkstation.Byretainingmoremailinauser'

sinbox,theimprovementsincontentindexingandsearchwithExchange 

canbeleveragedbyanyclient,makingrapiddiscoveryofuserinformationpossible.

∙Reducedmailboxmanagement 

Byallowinguserstohavelargemailboxes,theyareabletospendlesstimemanagingtheirmailboxestocleanupolditems.

∙Increasedproductivityforremoteworkers 

HavingExchange-basedaccesstomoree-maildataallowsremoteworkerstosecurelyaccesstheirExchange 

datafromInternetkiosks,computersatremoteclientlocations,theirWindowsMobile6devices,andfromhome.Whene-maildataisstoredinasecurelocation（Exchange）andisaccessedinasecurefashion（Outlook 

Access,OutlookAnywhere,andWindowsMobile）,securityrisksinherentinstoringinformationinnon-ITmanagedlocationsare 

reduced.

∙Eliminated.pstfiles 

Fromanend-userperspective,theabilitytolivewithout.pstfilesoffersasignificantincreaseintheusabilityofthee-mailsystem.Usersnolongerneedtoconcernthemselveswithhavingtoregularlypurgee-mailfromtheirmailboxestostayunderlowstoragequotalimits.Thereisnolongertheriskthatcriticale-mailstoredina.pstfilewillbelostduetocorruptionofthe.pstfileoradiskfailure.Eliminationof.pstfilesalsoensuresthatclientperformanceissuesduetoaccessing.pstfilesoverthenetworkareremoved.Travelingworkerswillnolongerbeunabletoretrieveacriticale-mailfroma.pstfilethatisstoredontheirdesktops.Additionally,travelingworkersnolongerneedtoworryaboute-maildatalossiftheirportablecomputerislostorstolen.

∙Eliminatedthird-partyarchivingstubfiles 

Theprimaryend-userbenefitofeliminatingstubfileswhenusingthird-partyarchivingsolutionsisprovidingaconsistentmailboxexperiencefrommultipleclients（includingWindowsMobile）.Thedeploymentandmanagementofadditionalthird-partyOutlook 

add-insarerequiredtomaketheuseofstubsolutionsworkwithOutlook.Although 

somesolutionsofferaccesstothearchivethroughOutlook 

Access,noneofthosesolutionsofferWindowsMobiledeviceaccess. 

Inmostcases,stubfileitemsizeisfrom10to15kilobytes（KB）.Theamountofusabledatacontainedinastubfileofthatsizeisminimal, 

usuallyafewparagraphsorless.Someofthearchivalsolutionprovidersrecommendastubfilesizefrom1to2KB,whichonlycontainsthemessageheaderinformation.Ifyouareretainingafewmonthsofstubfiles,thenumberofsearchhitstoreviewthemisrelativelylow. 

Therefore, 

locatingthedesiredmessagewithouthavingtomaketoomanysearchesthrough 

thearchiveisrealistic.However,ifseveralhundredthousandmessagesareretained,theprobabilityofsuccessfullylocatinga 

specificmessageischallengingwhenyoudo 

nothaveasignificantportionofthemessagebodyavailable.Asaresult,usersprobablyneedtogotothearchivemultipletimesand 

retrievemanymessagestofindthedesiredmessage.Third-partyarchivingsolutionssolvetheproblemofsupportingmailboxesthatcannotbeboundbysizelimitsandregulatorycompliancerequirementsforarchivalofalle-mailtraffic.However,whendeployed,thesesolutionsshouldbeconfiguredtomovethee-mailcontentoutofthemailboxwithoutretainingstubfilesinthemailbox.

BenefitsforAdministrators

BydesigninganenvironmenttosupportlargemailboxeswithExchange 

2007,administratorstakestepstoreducecostsandimproveITdepartmentagility.DeployinglargemailboxeswithExchange 

2007offersthefollowingbenefitstoadministrators:

∙PositionsITforhighavailabilityandrapidrecovery 

HighavailabilityanddisasterrecoveryhavebeencomplexareasinearlierversionsofExchange.TheExchange 

CCRfeatureeasilyallowsadministratorstoofferahighavailabilitysolutiontotheirorganizationwhilealsomovingawayfromtimeconsumingandcomplexrecoveryprocedures.CCRoffersasynchronousreplicationofabackupcopyoftheproductiondatathatcanberapidlyenabledshouldafailureoftheproductionserveroccur.WhenCCRisdeployed,standardrecoverytimesasfastastwominutesarenowpossible.

∙PositionsITtoreduceoreliminate.pstusage 

Because.pstfilesarenotgenerallymanagedbyITpros,thesefilesarelocatedultimatelyonknowledgeworkersportablecomputers,desktops,orfileshares;

oreveninpublicfolders.The.pstfilescanbecomeasignificantburdentoorganizationsbyimpactingserverandnetworkperformance,reducingusability,andincreasingsupportcosts.Generally,.pstfilesarenotbackedup,therebyincreasingtheriskofdataloss.Microsoftdoesnotsupportaccessto.pstfilesovernetworks.Alargepercentageofknowledgeworkerperformanceissuesinvolveaccessing.pstfilesstoredonfilesservers.Additionally,because.pstfilesareinherentlyportable,theyposeadatasecurityris