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powershellexchange-serverpst

Exchange 2013 export messages from last month

I want to backup Exchange messages incrementally each month. I've tried these scripts:

$d = (Get-Date).AddMonths(-1)
New-MailboxExportRequest -ContentFilter {Received -gt $d} -Mailbox "username" `
                         -name UserInc -filepath \\some\server\share\userinc.pst

and

$d = (Get-Date).AddMonths(-1).ToString('MM/dd/yyyy')
New-MailboxExportRequest -ContentFilter {Received -gt $d} -Mailbox "username" `
                         -name UserInc -filepath \\some\server\share\userinc.pst

Both scripts back up all messages in the mailbox.

Whereas:

New-MailboxExportRequest -ContentFilter {Received -gt '05/01/2016'} -Mailbox "username" `
                         -name UserInc -filepath \\some\server\share\userinc.pst

And:

$d = '05/01/2016'
New-MailboxExportRequest -ContentFilter {Received -gt $d} -Mailbox "username" `
                         -name UserInc -filepath \\some\server\share\userinc.pst

work flawlessly. Where am I going wrong?

Solution

  • This turned out to be a really nasty i18n bug in the Exchange Management Shell. Even though the ContentFilter expects a DD/MM/YYYY date for a UK Exchange installation, it still checks the date against the US format. This means that the date checks only work for the first twelve days of each month.