How Can I export external contacts from a specific OU in my AD into CSV?

My objective is to export about 1500 external contacts from a specific OU in a 2012 AD into CSV,  add  email addresses to this list and import back into the same OU then use Microsofts Dirsync to synchronise the contacts into o365.
Can any one help me with a script to do this?  So far I've tried the script below to export into CSV but unable to get a column for email:
Get-ADObject -Filter 'objectClass -eq "contact"' -searchbase "OU=contactupdate,ou=centre contacts,ou=qmm staging,dc=hounslow,dc=local"  -Properties mail |select name,@{e={"$($_.memberof)"};l="Member Of"} | Export-csv  c:\scripts\E2Contacts.csv -Nti.
The result of the above scripts is shown in the attached csv file. Its missing the email column which I need to add before the import.
C--scripts-E2Contacts.csv
Adeola OlamideAsked:
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lciprianionutCommented:
You are missing in the select statement the mail property.
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Adeola OlamideAuthor Commented:
Can you show me where please lciprianionut?
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lciprianionutCommented:
Get-ADObject -Filter 'objectClass -eq "contact"' -searchbase "OU=contactupdate,ou=centre contacts,ou=qmm staging,dc=hounslow,dc=local"  -Properties mail |select name,@{e={"$($_.memberof)"};l="Member Of"},mail | Export-csv  c:\scripts\E2Contacts.csv -Nti.
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