Rated 5 out of 5 stars

per TwentyTwenty el set. 3, 2011 ·

For the benefit of those unfamiliar with the acronym, ACR means the add-on “Add-on Compatibility Reporter".

I'm now using Thunderbird v 6.01 and with ACR installed RealPrev is working perfectly. I agree that it's hard to see why Mozilla hasn't built this navigation tool into the program. Once you've used it you'll wonder how you ever managed without it!