Once you receive notification that your mail quota is over 90% full, you need to free up some space to ensure you do not lose any incoming or outgoing mail.
It's recommended that you clear your sent mail, as this can often account for the majority of your mail storage.
1. One the File menu, select Export, and then click Messages.
2. Click OK in the following message:
This will export messages from Outlook Express Mail to Microsoft Outlook or Microsoft Exchange.
Note: If Outlook is not open, select the profile that you want to receive the messages, and then click OK.
3. Click to select either All or Selected Folders to export and then click OK.
The folders and contents will appear in the Inbox of the selected profile in Outlook. The date and time of each message are the dates and the time that you exported the messages from Outlook Express.
PART I - Preparing Thunderbird
1. Download the ImportExport add-on here choose 'Save Link As…' for Firefox and Chrome, or 'Save target as..' for Internet Explorer.
2. Save the file to your Desktop.
3. Open Thunderbird.
4. Select Tools, then Add-ons.
5. Click Extensions.
6. Click the little gear icon and choose Install Add-on From File.
7. Navigate to the importexporttools-126.96.36.199-tb.xpi file you downloaded, highlight the file and then click Open.
8. If the 'Install add-ons only from authors whom you trust' warning appears just click the Install Now button. Restart Thunderbird by clicking the Restart now link.
9. Close the Add-ons Manager tab.
PART II - Synchronize your mail to your folders
In order to export emails to your local computer, select the required email(s) and click on the More icon in the bar above:
In the dropdown list select Download (.eml) option and specify the location to save the email(s) to.
NOTE: .eml files are supported by most of the email services, so you can easily restore them later on different servers.
Unfortunately, Roundcube does not provide convenient functionality to download many emails at once, so if you want to back up the whole folder or account, we recommend using Horde instead.
In order to import the emails using Roundcube webmail, click on Gear icon > choose Import messages.
After this choose the backup file you wish to be imported and click Upload.
Once completed, you will see a notification confirming the messages have been successfully imported.
Ensure POP3 is enabled in your mail configuration. This can usually be found