User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727) Build Identifier: 1.5.0.5 (20060719) During the last 4 months the address book has taken longer and longer to open. Now it's up to 6 minuttes. I found that the prefs.js file is very large 2 MB, so I deleted half of it (only what seemed to be without importance). Then it only took 10-15 sec to open. I eventually cut it down to around 30 KB and now the address book opens immediately. Reproducible: Always The lines, that I took out of the prefs.js does not seem to affect the funtionallity of Thunderbird in any way. I deleted most of the lines that goes like: user_pref("ldap_2.servers._nonascii_992.filename", "_nonascii_992.mab"); user_pref("ldap_2.servers._nonascii_992.replication.lastChangeNumber", 0); user_pref("ldap_2.servers._nonascii_992.uri", "moz-abldapdirectory://_nonascii_992.mab"); and also most of the lines that goes like: user_pref("ldap_2.servers.user_directory_1000.filename", "user_directory_1000.mab"); user_pref("ldap_2.servers.user_directory_1000.replication.lastChangeNumber", 0); user_pref("ldap_2.servers.user_directory_1000.uri", "moz-abldapdirectory://user_directory_1000.mab");

The "growth" problem has been fixed in time for Thunderbird 2.0 by bug 230580. Therefore this is a duplicate of that bug. *** This bug has been marked as a duplicate of 230580 ***