I handled a similar conversion from cc:mail as follows:
 
Hand hold the "execs" and "noisy" users.  Move them first, and use the rules server to forward their mail to user@FQDN  to move the mail out of cc:mail and to imail.  The cc rules server bites, but it will do this well enough.
 
Give plenty of warning, and move the others en mass:
  1. Have each user create a new IMAP/POP3 account in OE for the new imail box.   Trying to use the existing reader account will just cause problems as message IDs won't match.  This is particularly true with IMAP, but even POP3 will cause problems if they use the "leave messages on server" checkbox.
  2. Users check both accounts and MX(or NAV) records point to cc:Mail until all users have new accounts setup, or you could use the cc rules server forwarding.
  3. Change the MX (or NAV) to point to iMail.
  4. Inform users that cc:Mail no longer receives mail.
  5. Keep cc:Mail up for a short interim time.
  6. Migrate messages from cc:Mail to iMail if needed.   One thing to note is that by having both boxes running, and separate OE accounts, you can allow the users to move what they want.
  7. Kill cc:Mail (this is worthy of a celebration).
Jerry
----- Original Message -----
Sent: Thursday, December 07, 2000 9:47 AM
Subject: [IMail Forum] Conversion from CC:Mail to IMail

Disclaimer:

I am using IMail for the first time and am finishing up reading the manual. :-)

****************************

My situation is that I am converting a 100-ish user CC:mail server setup to IMail.

In preparation for this move I have converted all users from the CC:Mail client to Outlook Express w/IMAP4 access to the CC:Mail Databases via their IMAP4 services interface. Outgoing mail goes via their SMTP services to an external Mail Relay Host since CC:Mail does not support that level of SMTP functionality. I also use NAV Email scanner in this mix.

In my hope of minimizing user disruption and a gradual cut over of users I figured I could do one of the following methods:

1.    Use the Peer server technique as described in the IMail manual - with a modification.
 
Or,

2.    Front the CC:Mail SMTP server with the IMail server. Populate it with all of the users accounts, then set forwarding on all accounts to the CC:Mail SMTP server based accounts. When I want to convert a user, I drop the forwarding, copy his IMAP folders and update his Outlook Express account info to point to the IMail server.

Now the questions:

For Method 1:

CC:Mail I suspect  MAY support the SMTP Verify command as needed for Peer server operation, but I don't know and have no documentation available to determine this. QUESTION: Is there a way I can test this via the Verify command (I don't know the command syntax of the sequence of commands to test this).

I figured if I implemented a Peer server technique but leave IMail with the lowest preference, Incoming mail would come only to the IMail server. Both servers would be configured as the same e-mail domain. As I cut over a user, I would add him to the IMail user accounts and as a result IMail would stop "forwarding" the user to the old server. I would manually copy over the users old IMAP folders and update his Outlook Express account setting to complete the move. QUESTION: If the CC:Mail server does not support the Verify command, would it still work or is there a way to 'help' make it work?

For Method 2:

Having both servers configured with the same e-mail domain name, is there a way to set forwarding on IMail so that the users I keep on the old server during the gradual conversion will get their incoming mail forwarded by IMail to CC:Mail SMTP. When I then move them to the new server, I remove the forward rule, move the folders and change the OE setting as mention above.
 

Any thoughts or suggestions?

Thanks!
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