I have experience with Microsoft Exchange, but I have no experience with POP3. I am not sure what the process is...
for seamlessly migrating from Adhost to Exchange Server.
Once you have a suitable target environment, create mailbox-enabled Active Directory users for everyone in your company. Take your account and make sure that you can log in correctly, and see the Global Address List. Next, send an outbound mail message to a test account you have on an external mail system.
Once you know logging on to the newly created accounts is possible, you then should speak with Adhost about moving your MX record. The MX record for your domain determines where inbound mail for @yourdomain.com flows to.
Set up a weekend that Adhost will switch your MX records from its gateway to your Exchange server.
Once the MX record is switched, you should plan on everybody using the new system when they come in on Monday morning. The POP mail can be stored locally in a PST -- just make sure Microsoft Exchange services are configured for end users to use the new mail server versus the POP client.
Remember, the end users will love you. POP vs. a full mail client will be an exciting switch that will enhance their overall messaging experience.
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