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Courex exports the contents of a Courier email client mailbox database (BOX file) to standard format files for email client migration or for archiving. Email messages are exported complete with integrated attachments. The Courier folder structure is preserved.


Courex exports email messages to standard eml and/or mbox files, directly into Thunderbird (one-step export-import), or as a Thunderbird format folder structure for transfer into non-Windows Thunderbird systems.


Although Courex has special features to support migration to Thunderbird, it's usefulness is certainly not limited to that client. Almost all email client applications can import from the eml/mbox format which, together with the fact that attachments stay attached to the message, makes it a very useful format for long-term archiving.


Courex also exports the Courier address book to a plain text comma-delimited Address.csv file. Courier already has this facility built-in, but Courex exports the fields optimised for import into Thunderbird. It is your choice whether to use the address book as exported by Courier or by Courex.


Courex also writes information it finds about Courier accounts to a plain text Accounts.txt file. This file can be used as a reminder of the correct server names, user names and passwords to use when entering account information into other client applications. This file cannot be used to import account information directly. Warning: The Accounts.txt file contains your passwords in plain text form.


You can also select whether to output files with DOS/Windows line terminators (CR/LF) or with Unix line terminators (LF only). This affects all files, including the Account.txt and Address.csv files. Use this option if you are migrating to a Unix/Linux system (or you can use it when exporting to Thunderbird for slightly smaller mailbox files - Thunderbird doesn't care what terminators are used).


Courex generally requires only the BOX file (but see next paragraph). No other files are required and the Courier application is not required to be installed on the system on which you are performing the export. If Courier is installed, it should not be running while using Courex.


From version 1.1, Courex will automatically re-integrate separated attachments detatched from the original message by Courier (that is, it will read the external file, if found, base64 or quoted-printable encode it, as necessary, then re-attach the encoded file to the message).


Version 1.0 could, under certain rare circumstances, miss some folders in some Courier mailboxes. Version 1.1 corrects that. Version 1.1 also improves the detection and correction of concatenated messages and fixes some small bugs elsewhere.


For some other differences between versions 1.0 and 1.1 see The Export.Log File.


From version 1.2, Courex can handle mailbox files up to 4GB in size. Previous versions were restricted to 2GB. A further improvement to the detection of concatinated messages has also been made. A positive "lock-out" of early Windows versions has been implemented. It will no longer try (and fail) to run on versions before 2000.