Export Email Messages from OWA in Office 365 Exchange Online

Introduction

This script can export email messages from Outlook Web App to a specific folder. These email messages will be saved in .eml format. You need to find the email messages by using search folder.

Scenarios

Microsoft Outlook allows you to export email messages very easily. However, this feature is not available in the Outlook Web App (OWA). Therefore, in order to export email messages from OWA, you must find a workaround.

Prerequisites

This script requires Exchange Web Service Managed API 2.0. Please download and install the package from Microsoft Download Center. This script cannot work correctly without this package.

Script

This script contains the following advanced functions:

Connect-OSCEXOWebService
New-OSCEXOSearchFolder
Get-OSCEXOSearchFolder
Export-OSCEXOEmailMessage

You can use this script in the following way.

Open Windows PowerShell.
Run Import-Module cmdlet to import this
module file.
Import-Module filepath\scriptname.psm1

Here are some code snippets for your references.

PowerShell

Edit|Remove

#Get the content and subject of email messages
$emailContent = $emailMsg.MimeContent.Content
$fileName = $emailMsg.Subject
foreach ($invalidChar in $invalidChars) {
    $fileName = $fileName.Replace($invalidChar,"")
}
 
#If file already exists then add ticks to the end of the file name
if (-not $AllowOverwrite) {
    $existingItemsCount = (Get-ChildItem -Path $Path -Filter "$fileName*" | Measure-Object).Count
    if ($existingItemsCount -gt 0) {
        $fileName = "$fileName - ($existingItemsCount)"
    }
}

#Get the content and subject of email messages$emailContent = $emailMsg.MimeContent.Content 
$fileName = $emailMsg.Subject 
foreach ($invalidCharin$invalidChars) { 
    $fileName = $fileName.Replace($invalidChar,"") 
} 
  
#If file already exists then add ticks to the end of the file nameif (-not $AllowOverwrite) { 
    $existingItemsCount = (Get-ChildItem-Path $Path-Filter"$fileName*"|Measure-Object).Count 
    if ($existingItemsCount-gt 0) { 
        $fileName = "$fileName - ($existingItemsCount)" 
    } 
}

Examples

Example 1: How to display help about Export-OSCEXOEmailMessage
To display help about this function, run this command.
Get-Help Export-OSCEXOEmailMessage -Full

Example 2: How to initiate a connection to Office 365 Exchange Online.
To initiate a connection to Office 365 Exchange Online, please run this command. You must run this example before
any other step.
Connect-OSCEXOWebService -Credential (Get-Credential admin@domain01.onmicrosoft.com)

Note The Connect-OSCEXOWebService function creates a new variable called exService. This variable is in the global scope of the current Windows PowerShell session. This variable is used by other functions in the script.

Example 3: How to create a search folder that contains the email messages with specific subject.
To create a search folder that contains the email messages with specific subject, please run this command.
New-OSCEXOSearchFolder -DisplayName "Subject contains 'Sales budget'" -Subject "Sales budget" -StartDate "10/01/2012 12:00:00 AM" -EndDate "12/31/2012 12:00:00 PM"

Example 4: How to export email messages in a search folder.
To export email messages in a search folder and keep this search folder after exporting, please run this command.
Get-OSCEXOSearchFolder -DisplayName "Subject contains 'Sales budget'" | Export-OSCEXOEmailMessage -Path C:\Scripts\055\Emails -KeepSearchFolder

Example 5: How to export email messages in a temporary search folder.
To export email messages in a temporary search folder, please run this command.
New-OSCEXOSearchFolder -Subject "Test email" | Export-OSCEXOEmailMessage -Path C:\Scripts\055\Emails

Additional Resources

Technical Resources:

Windows PowerShell Advanced Function
Working with search folders by using the EWS Managed API
Item.MimeContent Property

Forum Threads:
http://community.office365.com/en-us/forums/176/t/69677.aspx
http://community.office365.com/en-us/forums/160/t/72980.aspx