I switched to emClient a month ago so that I could sync with iCloud, and to my surprise the whole thing worked really well. It’s so much better than Thunderbird. Congratulations on doing a great job with this software!
This is to report a minor bug which seems to have sorted itself out now. I added four saved search folders, which worked fine. The next day the Search Folders link under Smart Folders had disappeared. I used the Create Search Folder link from the search box dropdown to try to create one of the folders again, and it complained that the folder already exists - and at this point the Search Folders link under Smart Folders suddenly reappeared. This is v6.0.19714.0 on Windows 7 SP1.
It seems to have sorted itself out now, as it hasn’t happened again, but I thought it was something you might at some point want to take a look at.