Tested with Tb trunk(Version=3.0a2pre,BuildID=2008052203 on MS Win-XP SP2). Trailing slash("/") in mail folder name causes mail data loss upon folder rename of parent folder. After restart, duplicate mail folder appear, due to incorrect mail folder file creation. When special occasion, "/" only subfolder name, no incorrect file is created. However, parent folder name in folder pane becomes "/" only name(child folder's name) after rename, even though file/directory name is properly renamed. Prolem recreation procedure is as follows. I guess that main cause is loss of trailing "/"(=path delimiter in URI) during internal mailbox: URL handling for rename of parent(where trainling "/" of subfolder name is not hashed yet). >(0) Create folder X1, X2 under Test-06 >(1) Create folder a//// under X1, create folder //// under X2 > (Folder pane display) (Directory content) > (Property,Location) > X1 Test-06.sbd\X1 > Test-06.sbd\X1.msf > Test-06.sbd\X1.sbd > a//// ac68b1ce0 > ac68b1ce0.msf > X2 Test-06.sbd\X2 > Test-06.sbd\X2.msf > Test-06.sbd\X2.sbd > //// e9e5f585 > e9e5f585.msf > >(2) Rename X1 to X1X, X2 to X2X > (Folder pane display) (Directory content) > (Property,Location) > X1X Test-06.sbd\X1X > Test-06.sbd\X1X.sbd > Test-06.sbd\X2X.sbd > a//// a > a.msf > ac68b1ce0 > ac68b1ce0.msf > //// Test-06.sbd\X2X > Test-06.sbd\X2X.msf > Test-06.sbd\X2X.sbd > //// e9e5f585 > e9e5f585.msf > - File of "a" & "a.msf" is newly created under X1X. > Trailing "////" part in mail folder name is ignored. > Folder property/Location for a//// says "a" is used. > - File name/directory name is successfully changed from X2 to X2X, > but folder name(should be X2X) in folder pane becomes ////. > Folder Property,Location of the //// says X2X is used. > >(3) Restart Thunderbird > - Two a//// appear in folder pane > (one for a,a.msf, one for ac681ce0,ac681ce0.msf) > (Folder pane display) (Directory content) > (Property,Location) > X1X Test-06.sbd\X1X > Test-06.sbd\X1X.msf > Test-06.sbd\X2X.sbd > a//// a > a.msf > a//// ac68b1ce0 > ac68b1ce0.msf > //// Test-06.sbd\X2X > Test-06.sbd\X2X.msf > Test-06.sbd\X2X.sbd > //// e9e5f585 > e9e5f585.msf

Phenomenon when "////" was phenomenon when "preceding /". When subfolder name of "////a", same result as "////" was obtained, except that folder name is "////a" instead of "////". > (Folder pane display) (Directory content) > (Property,Location) > ////a Test-06.sbd\X3X > Test-06.sbd\X3X.msf > Test-06.sbd\X3X.sbd > ////a 8fd86960 > 8fd86960.msf

When subfolder name of "a//b", "a///", "a////b", phenomenon was same as training "/" case, except incorrectly changed parent folder name is "a//b", "a///", "a////b" respectively instead of "a////". When subfolder name of "a/b", a,a.msf was not created(problem when trailing "/" didn't occur), and incorrect parent folder name didn't occur(problem when preceeding "/" didn't occur). However, directory of "Test-06.sbd\XnX.sbd\a.sbd" was created when parent folder name is renamed from Xn to XnX. This is same phenomenon as Bug 286523 on saved search folder of "a/b".

I think above can explain phenomenon on created file/directory when saved search folder(virtual folder) name has "/" in his folder name. (1) Preceding "/" : .../XnX.sbd/<preceding "/"(s)><ascii string including null> => Bug 358208 (search folder name of "// someting") (2) Training "/" : .../XnX.sbd/<ascii string including null><trailing "/"(s)> (3) Single "/" at mid : .../XnX.sbd/<non-null ascii><single "/"><non-null ascii> => Bug 286523 (search folder name of "X/Y")