Exchange 2010 last logon time to mailbox


Sometimes we need to find when user logged to mailbox for the last time.

To achieve this we need to use  Get-MailboxStatistics CMDlet

Below command will display LastLogonTime for mailbox JSmith:

Get-MailboxStatistics JSmith | select DisplayName, LastLogonTime


If we are using shared mailboxes we also should display user account which were used to log to mailbox.
This command will display mailbox name, LastLogonTime and user account used to logon:

Get-MailboxStatistics JSmith | select DisplayName, LastLogonTime, LastLoggedOnUserAccount


When we want to get logon time information for all mailboxes in database or in mailbox server MX01, we need to use Get-Mailbox CMDlet, and pipe result to Get-MailboxStatistics

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Export mailbox to pst larger than mailbox size


When we export mailbox from Exchange Server to .pst file, we can see that size of this .pst file is larger than mailbox size in Exchange Management Console (EMC).

We can export mailbox using New-MailboxExportRequest like below:

New-MailboxExportRequest -Mailbox "JSmith"  -Name JSmith -FilePath \\server\share\JSmith.pst


When we check .pst file size we will see that it’s larger than mailbox size.


Size difference between mailbox size and .pst export file size is caused by Recoverable Items.
When you export mailbox to .pst, all items in mailbox including Recoverable Items will be exported to .pst file. But when you check mailbox size in EMC, you check size of mailbox without Recoverable Items, so this is size difference.
In Recoverable Items you can find all items deleted by user which can be restored and calendar versioning it’s dumpster.


If  you want to check mailbox size with deleted items yet not purged (Recoverable Items) you have to use powershell and Get-MailboxStatistics CMDlet like below:

Get-MailboxStatistics JSmith | Format-List StorageLimitStatus,TotalItemSize,TotalDeletedItemSize,ItemCount,DeletedItemCount


As a result you will get mailbox size, and also Recoverable Items size, when you add them you will get total mailbox size after export to .pst file.