My company just recently switched from a pop3 email server to an imap server. Is there anyway to do this without losing the emails I already have on there?
Loosing the emails on your phone, or do you mean still hosted on their server?
They have a responsibility to not let anything get lost in the transition.
And I have never had anything get lost on the phone either when switching to a different app.
Give Blue Mail a try, it will talk to both types of servers just fine. It is very fast and works just like a desktop pc.
It can be configured to only download the title, or just a snippit, or the whole email when it first talks to the servers.
I have it confgiured to just get the title, then when I click on an email it will download the message.
* Blue Mail - Email App - Android Apps on Google Play