Saving Locally Cached IMAP Folders
To backup and save locally cached IMAP folders to protect against a loss of data on the upstream IMAP server.
Microsoft Outlook
- Open Outlook
- File Menu
Open & Export
- Import/Export
- Export to a file Outlook Data File (.pst)
- Select mailbox folders
- Give file destination and click finish.
Thunderbird
This is to save a selection of messages.
- right click on "Local Folders"
- "new folder", call it "saved"
- right click on the just created "saved" folder
- "new folder", call it "inbox"
- click on 2-screens icon in lower left hand corner of Thunderbird window to go into offline mode.
- choose "download later" if server is unavailable
- open inbox, select messages to save.
- drag them onto "Local Folders", "saved", "inbox"
- repeat above for "sent" and any folders into which you have saved mail
To export all folders see https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer