To get the last logon time for a user in exchange use the following powershell script:

Get-MailboxStatistics -identity "Joe smith" | select-object displayname, lastlogontime

If you want to see the lastlogontime for all users in a Distribution group, use the following powershell script:

$usergroup = Get-DistributionGroupMember -identity "DL name" -domaincontroller dcname

foreach ($user in $usergroup) { Get-MailboxStatistics -identity $user.samaccountname | select-object displayname, lastlogontime}

Export:

set-adserversettings -viewentireforest $true

new-mailboxexportrequest -mailbox “mailboxname” -Isarchive -filepath \\uncpath\archive.pst -mrsserver server

new-mailboxexportrequest -mailbox “mailboxname” -filepath \\uncpath\mailbox.pst -mrsserver server

Status:

get-mailboxexportrequest -mailbox “mailboxname” | Get-MailboxExportRequestStatistics

See http://www.stevieg.org/2010/07/using-the-exchange-2010-sp1-mailbox-export-features-for-mass-exports-to-pst/ for a mass export