Brian Hayden put forth on 2/27/2010 8:28 AM:
On Feb 27 2010, Stan Hoeppner wrote:
To add insult to injury, mailbox migration from Exch 5.5 IMAP to Dovecot IMAP was done using TB as the conduit, simply copying folders from one "account" to another. Took forever, but it was the only reliable way I could think of at the time to do it. It actually went very smoothly.
How large is the user base? Are the clients managed? And are you sure you haven't had any problems... only a very small number of users generally complain to relevant parties about a given issue, they grouse about it to their friends and colleagues.
Very small. Manual client management. No problems after the migration. If I complain, I'm sure I'll hear myself. ;) The migration I mentioned was my vanity server. If I were supporting an IMAP infrastructure at a $dayjob environment I would have never gone this route. And I probably wouldn't have been upgrading directly from Exchange 5.5 (which was EOL'd in like 1999 or 2000) to Dovecot 1.0.15. ;) I can't imagine an org that would have held onto Exch 5.5 into 2009, given that service packs and hotfixes ceased around a decade ago.
It's definitely possible to make it work with tight control. In a large, unmanaged environment, it really isn't. Unless you want to posit that the 80k users I dealt with for ten years on this were exceptionally stupid. ;)
That would depend on who those 80K users were. If they were federal employees, worse yet, HUD or USPS employees, I'd guess the stupidity meter would run pretty high. ;)
-- Stan