Mail crash now won't launch

Question

I was opening a Mail attachment (a PowerPoint file from a trusted source) last night when my BlackBook suddenly restarted itself for no reason. I happen to think that fact is coincidental to the problem, but at least it gives some background. After a restart (and a permissions repair just to be sure) Mail will not launch - just as it is about to draw the main window it quits. Safe boot has no effect, further permissions repairs also has no effect. Removing the Mail folder from ~/Library/ and home/Library and relaunching Mail from scratch results in Mail starting the Wizard and then it quits out again. Putting my account folders back one by one into the above location also has no effect. I'm also suddenly getting "unexpectedly quit" messages for something called Pub Sub Agent which I'm sure must be related. The crash report says that the thread concerned has "sqlite" in it as well as Pub Sub Agent. Deleting the .plist files for Mail also ineffective.
I'm now at the limit of my knowledge. The only remedy I can think of is to reinstall the OS, which is a bit overkill just to get Mail back. I've downloaded Thunderbird meantime but I really want to get Mail back. Any advice gratefully received. Thanks.
Message was edited by: mackixwindoze

Answer 1

Here's the relevant thread from the crash report:
Thread 2 Crashed:
0 libsqlite3.0.dylib 0x93eb2047 sqlite3CreateForeignKey + 983
1 libsqlite3.0.dylib 0x93ef8f93 yy_reduce + 16963
2 libsqlite3.0.dylib 0x93efb66c sqlite3Parser + 780
3 libsqlite3.0.dylib 0x93efb972 sqlite3RunParser + 290
4 libsqlite3.0.dylib 0x93efd9c8 sqlite3Prepare + 2056
5 libsqlite3.0.dylib 0x93efe592 sqlite3_exec + 114
6 libsqlite3.0.dylib 0x93eff1d0 sqlite3InitCallback + 784
7 libsqlite3.0.dylib 0x93efe74b sqlite3_exec + 555
8 libsqlite3.0.dylib 0x93effd0d sqlite3InitOne + 2477
9 libsqlite3.0.dylib 0x93effe90 sqlite3Init + 112
10 libsqlite3.0.dylib 0x93f037ef prepSelectStmt + 3375
11 libsqlite3.0.dylib 0x93f03d37 sqlite3SelectResolve + 103
12 libsqlite3.0.dylib 0x93ee2ecf sqlite3Select + 511
13 libsqlite3.0.dylib 0x93ef691e yy_reduce + 7118
14 libsqlite3.0.dylib 0x93efb66c sqlite3Parser + 780
15 libsqlite3.0.dylib 0x93efb9d8 sqlite3RunParser + 392
16 libsqlite3.0.dylib 0x93efd9c8 sqlite3Prepare + 2056
17 com.apple.PubSub 0x94cd75a0 SQLite::Database::compile(char const*) + 134
18 com.apple.PubSub 0x94cd8876 SQLite::Query::statement() + 162
19 com.apple.PubSub 0x94cd8968 SQLite::Query::takeStatement() + 18
20 com.apple.PubSub 0x94cd5aeb SQLite::Cursor::_init(SQLite::Query*, bool) + 43
21 com.apple.PubSub 0x94cf81f0 SQLite::CursorOf<PubSub::ClientCore>::CursorOf(SQLite::QueryOf<PubSub::ClientCo re>*, bool) + 38
22 com.apple.PubSub 0x94cf78a9 +[PSClient allClientBundleIdentifiers] + 159
23 com.apple.MessageFramework 0x0047d9c5 -[RSSInterchange _runManager] + 385
24 com.apple.Foundation 0x94fd25ad -[NSThread main] + 45
25 com.apple.Foundation 0x94fd2154 _NSThread__main_ + 308
26 libSystem.B.dylib 0x93f62c55 pthreadstart + 321
27 libSystem.B.dylib 0x93f62b12 thread_start + 34