Too inefficient Rated 1 out of 5 stars
I loaded a message in Thunderbird 10, which contained a winmail.dat attachment (~1.2 MB). As a result of that I received for about 10 minutes numerous messages:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
I clicked Continue on each of them. After that I tried to open one of the resultant attachments and again received numerous messages with the same text. During that I noticed that the memory usage of Thunderbird fluctuated widely (it doubled several times for brief moments).
After several minutes Thunderbird finally showed an Open dialog window.