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Is migrating emails from one hosting provider to another a trouble?

I rent a shared-hosting environment with CentOS-Bash, Apache, PHP, MySQL and a web-based IMAP email client (Roundcube) and some more tools, on which I host my personal website;<br>
I don't have Cpanel there, rather the browser / graphical user interface and some of its tools are all developed by the hosting company itself.

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On that shared-hosting environment I have basically two databases:

* One database is for my website
* One database is for emails from my website's contact form

I never actually used Roundcube --- it may or may not be MySQL based as well but even if it does utilize MySQL I believe that the two databases would be totally separate (i.e. not under the same data structure).

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Let's say I start using Roundcube and host contact form emails on it but after some time I decide to leave my hosting provider to another hosting provider which might use another type of email client (i.e. not Roundcube).

I would need to keep records of my emails due to accounting standards and taxation issues but I might not be able to just directly migrate them from ROundcube to another program (if indeed a possible new hosting provider doesn't use Roundcube) and that **may be** a problem.

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Is migrating emails from one hosting provider to another a trouble?<br>
How to prevent problems in this context in the long run?