The case Because of obsolescense of hardware a new server was needed. That meant a migration to a new version of MS Windows and Exchange server. Budget constraints made this unviable, so this was the opportunity to move to free software. I'd want to point that the navy was already using free software.
What should be migrated <ul><li>Because of lack of reliability a multiserver configuration was used.
This was managed by Exchange transparently and we needed to emulate this. </li></ul>
Our solution <ul><li>The components we choose: </li><ul><li>OpenLDAP for the users data backend.
Postfix as the SMTP server, for security, maturity and ease of management.
Cyrus for IMAP and POP access and user authentication using SASL.
Some homemade scripts to automate tasks. </li></ul></ul>
The configuration <ul><li>The key component of the Postfix configuration are: </li><ul><li>The virtual lookup tables.
The transport table. </li></ul><li>We used the vaddress attribute of the ldap open-xchange.schema to route mails to the apropiate server.
With the mailEnabled attribute set to no the mail was routed to the Exchange Server. By this we move the accounts little by little.
LDAP is replicated in each server running Postfix. </li></ul>
As dicas!! From this and other experiences I'd like to give some tips and tools to help you who want to be free.
What we learned: UAF <ul><li>There are three factor to take into account in any migration project. </li><ul><li>The U sers (all of them).
Identify all users and how they use the system. If necesary write use-cases. </li></ul><li>Carefull planning. </li><ul><li>Big bang seldom works. </li></ul><li>Store your data in standar formats. </li><ul><li>Proprietary software don't like when people want to get out. </li></ul></ul>
Tank you very much Muito obrigado http://www.elgallego.info Fica de olho em http://www.pandorafms.org
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