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mail server migration


I am working in UK for a company having 100+ mail boxes with BT.
I am migrating our company's mail services from BT mail boxes (pop3) to in-house mail server. i am using mdaemon mail server ver 12.x Blackberry edition with anti spam and anti virus protection inbuilt.

for that, first i have migrated one test domain's mx record to my range of public ip and created and tested few of the mail accounts. which is working fine. Hardware is fine. leased line based internet facility working fine. firewall is configured properly.

now, i need to migrate the live domain mx records and need some precautionary information.

basically, my current settings for mail clients are simple - BT mail boxes, MS outlook, outlook express and other email clients on different computers.

I have around 100 mail boxes and lots of aliases like and quite a few having forwarding set on BT managed services.

As i am doing this kind of migration for the first time, i am bit worried about the down time and disruptions in the services.
I have created mail boxes for all the required users same as aliases for the domains, we need to migrate emails for.  now i am planning to do Multipop temporarily to avoid email loss. so previous options (pop3) can work and new option IMAP will be stated in parallel.

So i want to know whether this is the correct method or i can use other simple and effective method to migrate to in-house server?
also which outlook connectors to use to connect to email server? mdaemon having their own but not working for previous version like outlook express and dont know about apple mac.

if someone can help me out quickly with some expert advice?


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