User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1 Build Identifier: Mozilla Thunderbird version 1.5.0.9 (20061207) When using the Profile Manager under Windows to create a new profile, the UI will not properly accept any Windows root drive (i.e. "C:", "D:", "X:", etc.) The dangerous part is that the profile manager seems to accept the entry, and the user may not notice that the "My Documents" folder in %userprofile% is actually being used instead. If they later elect to remove the profile using profilemanager, along with the "Delete Files" option, they will inadvertently wipe out their entire My Documents folder! Reproducible: Always Steps to Reproduce: 1. from Windows, start the Profile Manager ("start thunderbird -profilemanager" from a command prompt) 2. select "Create Profile" 3. enter a profile name, then click "Choose Folder" 4. chose any drive letter (i.e. "C:" or "X:") as the Folder name Actual Results: The user preferences folder will not be updated, so the "My Documents" folder (or whatever had previously been chosen) will end up being selected instead. Expected Results: The user settings folder should have been set to C:\ (or X:\ or whatever the user had specified). This *would* be a very minor bug, if not for the fact that under the wrong circumstances the user can inadvertently delete their *entire* Windows "My Documents" folder!

confirmed! Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9a2pre) Gecko/20070108 Thunderbird/3.0a1 ID:2007010803

Also subject of this bug: SeaMonkey 2.0a.