Change Powershell script get stats to get user from csv

Dear experts

who can help me with this one below? The input also should come from a csv with 1 column called "user"
with alias or samAccountNamenot no for user at all

Thanks
Mandy

#############################################################################
 # PS-Merge.ps1
 # Description:
 # This script combines three commands and sends the output into a CSV file
 #
 # Jonas Andersson, MCC 2011
 # http://www.testlabs.se/blog
 # Twitter @jonand82
 #############################################################################
 
$Database = @{Name="Database";Expression={ $stats.database }}
 $DisplayName = @{Name="DisplayName";Expression={ $stats.DisplayName }}
 $StorageLimitStatus = @{Name="StorageLimitStatus";Expression={ $stats.StorageLimitStatus }}
 $TotalItemSize = @{Name="MailboxSize";Expression={ $stats.TotalItemSize }}
 $itemcount = @{Name="MailboxSize";Expression={ $stats.itemcount }}
 $Company = @{Name="Company";Expression={ $user.Company}}
 $FirstName = @{Name="FirstName";Expression={ $user.FirstName}}
 $LastName = @{Name="LastName";Expression={ $user.LastName}}
 $LastLogon = @{Name="LastLogon";Expression={ $stats.LastLoggedOnUserAccount}}
 $LastLogonTime = @{Name="LastLogonTime";Expression={ $stats.LastLogonTime}}
 $UserUPN  = @{Name="UPN";Expression={$user.UserPrincipalName}}
 $Primary = @{Name="PrimarySMTP";Expression={$EmailAddress.PrimarySMTPAddress}}
 $Emails   = @{Name="Emails";Expression = { $EmailAddress.EmailAddresses | where { $_.prefixstring -ceq "smtp"}}}
 
 
$Mailboxes = Get-Mailbox -ResultSize Unlimited
 $Mailboxes | foreach {
 $user = Get-User $_
 $stats = Get-MailboxStatistics $_
 $EmailAddress = Get-Mailbox $_
 $_ | select Alias,$DisplayName,$itemcount,$TotalItemSize,$Database,$UserUPN,$Primary,$Emails
 } | Export-CSV -NoTypeInformation C:\AllMailboxesStats.csv

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