I used Incredimail when it first started and it was fantastic, so different and fun to use. You paid for everything with a single fee which was for life and never experienced any problems until they were taken over and since then things have changed dramatically. Gone are all the great features it originally had, if you want them now you have to pay for them and each one is a separate fee and not for life but on annual subscription. I don't know what they did, but from the moment it was taken over things started to break down. Crashes, skins changing whenever they felt like it, syncing problems, loading problems and the list goes on. I recently installed 2.5 and the problems just got worse and worse and even though I paid for no ads, ads for Incredimail were being seen on emails sent out. Support is utterly useless and Incredimail is unfit for purpose. It has a mind of it's own and full of problems that no-one seems to be able to fix. Incredimail's new owners are just money cows. Unless you want a very basic email system you have to pay to enjoy a feature even though it may not work! May as well stick with your Gmail/Yahoo/Outlook etc.
DO NOT WASTE YOUR MONEY WITH INCREDIMAIL!