I probably messed up big time. Here's what I did, 1. Installed SBS 2011 on a system with two drives, C: and D:. 2. After installation, mirrored the drives. So now there is only the C: drive. 3. Discovered that Exchange could not mount the mailbox and public databases. Exchange had put its databases on the D: drive. 4. Deleted the old mailbox and created a new one using EMC. 5. Deleted the public database using ADSIedit and created a new one. 6. Successfully mounted the databases. So now the mailbox and public databases are mounted and all of the recipients are listed in EMC's Recipient Configuration. But when I attempt to access a mailbox using OWA, I receive the message, "A mailbox couldn't be found for <domain>\<user>. If the problem continues, contact your helpdesk." I have tried a number of mailboxes and all come up with this message. This is a pretty tangled web so I hope somebody can point me in the right direction. Thanks.

Can you run this shell command Get-Mailbox -Identity "username" |FL and paste the result

Hi Rajkumar, Here is the output. I've masked the domain and user name. Thanks. [PS] C:\Windows\system32>Get-Mailbox -Identify "username" "FL RunspaceId : bf9b0935-7b28-45b6-99da-7e74ca54ec64 Database : UseDatabaseRetentionDefaults : True RetainDeletedItemsUntilBackup : False DeliverToMailboxAndForward : False LitigationHoldEnabled : False SingleItemRecoveryEnabled : False RetentionHoldEnabled : False EndDateForRetentionHold : StartDateForRetentionHold : RetentionComment : RetentionUrl : LitigationHoldDate : LitigationHoldOwner : ManagedFolderMailboxPolicy : RetentionPolicy : CalendarRepairDisabled : False ExchangeGuid : cd9f3179-e97b-413b-a7aa-4293f850b8dc ExchangeSecurityDescriptor : System.Security.AccessControl.RawSecurityDescriptor ExchangeUserAccountControl : None MessageTrackingReadStatusEnabled : True ExternalOofOptions : External ForwardingAddress : ForwardingSmtpAddress : RetainDeletedItemsFor : 14.00:00:00 IsMailboxEnabled : False Languages : {en-US} OfflineAddressBook : ProhibitSendQuota : 2 GB (2,147,483,648 bytes) ProhibitSendReceiveQuota : 2 GB (2,147,483,648 bytes) RecoverableItemsQuota : unlimited RecoverableItemsWarningQuota : unlimited DowngradeHighPriorityMessagesEnabled : False ProtocolSettings : {HTTP11, OWA1, RemotePowerShell1} RecipientLimits : unlimited IsResource : False IsLinked : False IsShared : False LinkedMasterAccount : ResourceCapacity : ResourceCustom : {} ResourceType : SamAccountName : username SCLDeleteThreshold : SCLDeleteEnabled : SCLRejectThreshold : SCLRejectEnabled : SCLQuarantineThreshold : SCLQuarantineEnabled : SCLJunkThreshold : SCLJunkEnabled : AntispamBypassEnabled : False ServerLegacyDN : /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Co nfiguration/cn=Servers/cn=SERVER1 ServerName : server1 UseDatabaseQuotaDefaults : False IssueWarningQuota : 1.902 GB (2,042,626,048 bytes) RulesQuota : 64 KB (65,536 bytes) Office : UserPrincipalName : username@domainname.local UMEnabled : False MaxSafeSenders : MaxBlockedSenders : ReconciliationId : WindowsLiveID : ThrottlingPolicy : RoleAssignmentPolicy : Default Role Assignment Policy SharingPolicy : Default Sharing Policy RemoteAccountPolicy : MailboxPlan : ArchiveDatabase : ArchiveGuid : 00000000-0000-0000-0000-000000000000 ArchiveName : {} ArchiveQuota : unlimited ArchiveWarningQuota : unlimited ArchiveDomain : ArchiveStatus : None RemoteRecipientType : None DisabledArchiveDatabase : DisabledArchiveGuid : 00000000-0000-0000-0000-000000000000 QueryBaseDNRestrictionEnabled : False MailboxMoveTargetMDB : MailboxMoveSourceMDB : MailboxMoveFlags : None MailboxMoveRemoteHostName : MailboxMoveBatchName : MailboxMoveStatus : None IsPersonToPersonTextMessagingEnabled : False IsMachineToPersonTextMessagingEnabled : False UserSMimeCertificate : {} UserCertificate : {} CalendarVersionStoreDisabled : False ImmutableId : PersistedCapabilities : {} SKUAssigned : False AuditEnabled : False AuditLogAgeLimit : 90.00:00:00 AuditAdmin : {Update, Move, MoveToDeletedItems, SoftDelete, HardDelete, FolderBind, SendAs, SendOnBehalf, Create} AuditDelegate : {Update, SoftDelete, HardDelete, SendAs, Create} AuditOwner : {} WhenMailboxCreated : 6/24/2011 4:10:33 PM UsageLocation : Extensions : {} HasPicture : False HasSpokenName : False AcceptMessagesOnlyFrom : {} AcceptMessagesOnlyFromDLMembers : {} AcceptMessagesOnlyFromSendersOrMembers : {} AddressListMembership : {\Mailboxes(VLV), \All Mailboxes(VLV), \All Recipients(VLV), \Default Global A ddress List, \All Users} Alias : username ArbitrationMailbox : BypassModerationFromSendersOrMembers : {} OrganizationalUnit : domainname.local/MyBusiness/Users/SBSUsers CustomAttribute1 : CustomAttribute10 : CustomAttribute11 : CustomAttribute12 : CustomAttribute13 : CustomAttribute14 : CustomAttribute15 : CustomAttribute2 : CustomAttribute3 : CustomAttribute4 : CustomAttribute5 : CustomAttribute6 : CustomAttribute7 : CustomAttribute8 : CustomAttribute9 : DisplayName : UserFirstname UserLastname EmailAddresses : {SMTP:username@domainname.com} GrantSendOnBehalfTo : {} ExternalDirectoryObjectId : HiddenFromAddressListsEnabled : False LastExchangeChangedTime : LegacyExchangeDN : /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Re cipients/cn=UserFirstname UserLastname MaxSendSize : unlimited MaxReceiveSize : unlimited ModeratedBy : {} ModerationEnabled : False PoliciesIncluded : {87d277d2-0b41-4226-979d-5f9185a0da49, {26491cfc-9e50-4857-861b-0cb8df22b5d7}} PoliciesExcluded : {} EmailAddressPolicyEnabled : True PrimarySmtpAddress : username@domainname.com RecipientType : UserMailbox RecipientTypeDetails : UserMailbox RejectMessagesFrom : {} RejectMessagesFromDLMembers : {} RejectMessagesFromSendersOrMembers : {} RequireSenderAuthenticationEnabled : False SimpleDisplayName : SendModerationNotifications : Always UMDtmfMap : {emailAddress:48824, lastNameFirstName:88244734679, firstNameLastName:47346798 824} WindowsEmailAddress : username@domainname.com MailTip : MailTipTranslations : {} PartnerObjectId : 00000000-0000-0000-0000-000000000000 IsValid : False ExchangeVersion : 0.10 (14.0.100.0) Name : UserFirstname UserLastname DistinguishedName : CN=UserFirstname UserLastname,OU=SBSUsers,OU=Users,OU=MyBusiness,DC=domainname,DC=local Identity : domainname.local/MyBusiness/Users/SBSUsers/UserFirstname UserLastname Guid : e1be3b4b-bf8f-40e6-90f2-ec92db9b1e89 ObjectCategory : domainname.local/Configuration/Schema/Person ObjectClass : {top, person, organizationalPerson, user} WhenChanged : 7/6/2011 9:52:48 PM WhenCreated : 6/24/2011 10:11:11 AM WhenChangedUTC : 7/7/2011 4:52:48 AM WhenCreatedUTC : 6/24/2011 5:11:11 PM OrganizationId : OriginatingServer : SERVER1.domainname.local WARNING: The object domainname.local/MyBusiness/Users/SBSUsers/UserFirstname UserLastname has been corrupted, and it's in an inconsistent state. The following validation errors happened: WARNING: Database is mandatory on UserMailbox. WARNING: Database is mandatory on UserMailbox.

3. Discovered that Exchange could not mount the mailbox and public databases. Exchange had put its databases on the D: drive. 4. Deleted the old mailbox and created a new one using EMC. 6. Successfully mounted the databases. So now the mailbox and public databases are mounted and all of the recipients are listed in EMC's Recipient Configuration. Hi g2e, Do you mean you delete the old mailbox database which includes user's mailboxes? I think you did it. From the output of Get-Mailbox, the Database property is blank. If you have made a backup of mailbox database ago, try to restore it. If not, you have to recreate the new mailboxes for users.