I need to export a list of exchange users with their email addresses.

That is exactly what I asked for! BUT...in looking at it I see former employees on the list. Is there a way to list ONLY the employees that are enabled?

In case your users have more than one email address defined on their mailbox you can extract all of them. All data is saved on one line with $delim as delimiter. Delimiter and file extension can be changed.
example output:
-----------------------
user1;user1@domain1.com;user1@domain2.com
user2;user2@domain1.com

$delim = ";"
get-mailbox -resultsize unlimited | % {$_.displayname + "$delim" + ($_.emailaddresses.smtpaddress -join "$delim") } > $env:userprofile\addressreport.csv
write-host "report saved as $env:userprofile\addressreport.csv"

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well that just produced a lot of names with no addresses. I do not care about multiple addresses all I need is the users names with the reply address. the first command line was great but includes more than I need. Is there a way to trim the disabled users?

You will need to use activeDirectory Module in conjunction with exchange.

You need both EMC and Active Directory Powershell  installed
Tweaked a bit from the above recommendations

Get-PSSnapin -Registered | Add-PSSnapin
Import-module ActiveDirectory

$ActiveUsers = Get-ADUser -filter * -properties enabled | ?{$_.enabled -eq $true}
$A = @()
Foreach ($mailbox in $ActiveUsers)
{
$A += Get-Mailbox -Identity $mailbox.SamAccountName -ErrorAction SilentlyContinue -WarningAction SilentlyContinue| select displayname,primarysmtpaddress 
$A | Export-Csv -Path C:\temp\test.csv -NoTypeInformation -Force 
}

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It's not clear to me what produced lot of names with no addresses, if you paste the command i may be able to help.
We can filter out disabled users  but we have to know the criteria which makes them disabled. The following filters out disabled users in AD:

Get-Mailbox -resultsize unlimited | ? { (Get-User $_.Alias).UserAccountControl -notmatch 'AccountDisabled' } | select-object DisplayName,PrimarySMTPaddress | Export-Csv "c:\temp\ExchangeUsers.csv" -NoTypeInformation

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well Yo_bee that appeared to run pretty cool but I ended up with >> at the end and no output in my C:\temp folder so I assume something went wrong

can you post your code?
I would also run it without the | Export-Csv -Path C:\temp\test.csv -NoTypeInformation -Force

Get-PSSnapin -Registered | Add-PSSnapin
Import-module ActiveDirectory

$ActiveUsers = Get-ADUser -filter * -properties enabled | ?{$_.enabled -eq $true}
$A = @()
Foreach ($mailbox in $ActiveUsers)
{
$A += Get-Mailbox -Identity $mailbox.SamAccountName -ErrorAction SilentlyContinue -WarningAction SilentlyContinue| select displayname,primarysmtpaddress 
$A 
}

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to verify if $a has an output.

Wait so you leave mailboxes for former employees enabled?  Everyone is assuming you disable the AD user, can you confirm?  Why do  you leave the mailboxes enabled?

@jason

In my environment we monitor  their mailbox for a period of time, but there is no reason to leave them enabled. This closes a possible security issue if we left their accountable.

Ok to each his/her own.  I generally just add the email address as a proxy to whoever wants to monitor the mail flow and disable the mailbox but either works.  To get around the present snag you'd have to mark the mailbox somehow either by assigning a value to a CustomAttribute (like F for FIRED or get the F out of here haha) or some other filterable property.  You could compare disabled users to enabled mailboxes, but that seems prone to accidental mistakes.  Let me know what you decide and I can rewrite my version of the 'script'.

There a so many ways to skin this cat.  I just gave the Asker what he was asking for.

Export list of all email addresses to a .CSV file using Exchange Management Shell (EMS):

Get-Mailbox -ResultSize Unlimited -OrganizationalUnit “OU=Phoenix Users,OU=Phoenix,DC=CONTOSO,DC=COM” |Select-Object DisplayName,PrimarySmtpAddress, @{Name=“EmailAddresses”;Expression={$_.EmailAddresses |Where-Object {$_.PrefixString -ceq “smtp”} | ForEach-Object {$_.SmtpAddress}}} | Export-CSV c:\exportsmtp.csv -NoTypeInformation

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lots of good input thanks