How to Create Mailboxes in Exchange Server 2010 from Cmdlet

In the Exchange Management Shell, you can create a user account with a mailbox by using the New-Mailbox cmdlet. 
Here's an example of the syntax and usage. 

Note: When you are prompted, enter a secure password for the new user account. 

Syntax

New-Mailbox -Name Name -Password Password

-UserPrincipalName UserNameAndSuffix

[-MailboxPlan <MailboxPlanIdParameter>] {AddtlParams} {ModParams}

New-Mailbox -Name Name -Password Password -WindowsLiveID WindowsLiveId

[-EvictLiveId {$true | $false}] [-MailboxPlan MailboxPlanId]

{AddtlParams} {ModParams}

New-Mailbox -Name Name -UserPrincipalName UserNameAndSuffix

[-MailboxPlan MailboxPlanId] {AddtlParams} {ModParams}

New-Mailbox -Name Name -UseExistingLiveId {$true | $false} -WindowsLiveIDWindowsLiveId

[-MailboxPlan MailboxPlanId] {AddtlParams} {ModParams}

New-Mailbox -Name Name -Shared {$true | $false} -UserPrincipalNameUserNameAndSuffix

[-Password Password] {AddtlParams} {ModParams}

New-Mailbox -Name Name -Room {$true | $false} -UserPrincipalNameUserNameAndSuffix

[-Password Password] {AddtlParams} {ModParams}

New-Mailbox -Name Name -Equipment {$true | $false} -UserPrincipalNameUserNameAndSuffix

[-Password Password] {AddtlParams} {ModParams}

New-Mailbox -Name Name -LinkedDomainController DCName

-LinkedMasterAccount Identity -UserPrincipalName UserNameAndSuffix

[-LinkedCredential Credential] [-Password Password]{AddtlParams} {ModParams}

New-Mailbox -Name Name -ImportLiveId {$true | $false}

-WindowsLiveIDWindowsLiveId {AddtlParams} {ModParams}

New-Mailbox -Name Name -Arbitration {$true | $false} -UserPrincipalNameUserNameAndSuffix

[-Password Password] {AddtlParams}

New-Mailbox -Name Name -FederatedIdentity FederatedId -WindowsLiveIDWindowsLiveId {AddtlParams}

{ModParams}

[-ArbitrationMailbox ModeratorMailbox] [-ModeratedBy Moderators][-ModerationEnabled <$true | $false>]

[-SendModerationNotifications<Never | Internal | Always>]

{AddtlParams}

[-ActiveSyncMailboxPolicy MailboxPolicyId] [-Alias ExchangeAlias] [-Archive {$true | $false}]

[-Database DatabaseId] [-DisplayName Name] [-DomainController FullyQualifiedName] [-FirstName FirstName]

[-Initials Initials] [-LastName LastName] [-ManagedFolderMailboxPolicy MailboxPolicyId]

[-ManagedFolderMailboxPolicyAllowed {$true | $false}] [-Organization OrgName] [-OrganizationalUnit OUName]

[-PrimarySmtpAddress SmtpAddress] [-QueryBaseDNRestrictionEnabled <$true | $false>]

[-RemoteAccountPolicy RemoteAccountPolicyId] [-ResetPasswordOnNextLogon <$true | $false>]

[-SamAccountName PreWin2000Name] [-SharingPolicy SharingPolicyId] [-ThrottlingPolicy ThrottlingPolicyId]

Usage

New-Mailbox -Name "Sachin Kumar" -Alias "sachink" -OrganizationalUnit "techpeoples.net/Exchange"

-Database "Exchange Support" -UserPrincipalName " sachink@techpeoples.net" -SamAccountName "sachink" -FirstName "Sachin"

-Initials "S" -LastName "Kumar" -ResetPasswordOnNextLogon $true -Archive $true