A colleague of mine who was using Evolution mail client since past few years finally decided to start using Thunderbird. But the biggest challenge was moving his emails and contact list to Thunderbird client as there is no builtin functionality available in Thunderbird for the same.
As usual Google came to the rescue and I found a nice article which I thought is worth sharing with everyone. This article written by Damien provides step-by-step assistance in migrating your emails, contacts, calendar, tasks and other things from Evolution to Thunderbird.
The migration process went very well after following all the steps given there. We were mainly interested in mails and contacts but I am sure the other data can also be migrated with same ease.
If you also find the article helpful, do thank him on his blog.