Cannot receive emails, download speed down to 0KBs and freezes. Please Help

Question

I am having trouble with my Mac Mail. when I start up the program, all new mail starts coming in and halfway through it will stop, download time goes down to 0KBs, and I cannot receive any new emails. Happens every time, after closing, force quit, restarting, updates, I cannot fix this.
I managed to get a error message from Terminal. Hopefully someone can understand what this is...
**++Last login: Tue Mar 3 09:54:33 on console++**
**++/Applications/Mail.app/Contents/MacOS/Mail ; exit;++**
**++[Administrators-Computer-3:~] admin% /Applications/Mail.app/Contents/MacOS/Mail ; exit;++**
**++2009-08-27 10:00:18.404 Mail[406:807] * CFMessagePort: bootstrap_register(): failed 1100 (0x44c) 'Permission denied', port = 0x7b03, name = 'com.apple.mail.ServiceProvider'++**
**++See /usr/include/servers/bootstrap_defs.h for the error codes.++**
**++2009-08-27 10:00:24.764 Mail[406:807] A sync alert handler is already registered in a different process for the client com.apple.Mail++**
**++Stack Trace: (++**
*+(+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*+997376+*
*+))+*
**++2009-08-27 10:00:25.175 Mail[406:807] A sync alert handler is already registered in a different process for the client com.apple.Mail.BookmarksSyncher++**
**++Stack Trace: (++**
*+(+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*+997376+*
*+))+*
**++2009-08-27 10:00:25.298 Mail[406:b603] Bookmarks Manager: error "The file “AvailableFeeds” could not be opened." in -[BookmarksManager countOfSubscribedFeeds]++**
**++2009-08-27 10:00:26.234 Mail[406:807] A sync alert handler is already registered in a different process for the client com.apple.Mail.Notes++**
**++Stack Trace: (++**
*+(+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*+997376+*
*+))+*
**++2009-08-27 10:00:26.987 Mail[406:cc1f] Seen Messages: error "The file “MessageUidsAlreadyDownloaded3” could not be opened." in -[SeenMessagesManager saveChanges]++**
**++2009-08-27 10:00:27.151 Mail[406:cc1f] prepareForSave:: save for NSSQLCore 0x7c5380 is already in progress++**
**++during invocation of -[MessageRouter routeQueuedMessages]++**
**++Stack Trace: (++**
*+(+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*[phone],+*
*+4635448,+*
*+4093436,+*
*+4004472,+*
*[phone],+*
*[phone],+*
*+3893744,+*
*+3897248,+*
*[phone],+*
*[phone]+*
*+))+*
**++2009-08-27 10:00:28.046 Mail[406:c42b] SyncServices[ISyncSessionDriver]: Caught top level exception: I/O error for database at /Users/admin/Library/Mail/AvailableFeeds. SQLite error code:1, 'SQL logic error or missing database' Stack trace: (0x92473cf0 0x93b3c4ec 0x95607bd0 0x9560763c 0x9560b304 0x95630a44 0x95626fb0 0x95626be0 0x3698a4 0x3697a4 0x955f9a38 0x95633ee4 0x95633844 0x95633628 0x955fb5b8 0x955fb13c 0x955fa4d0 0x369520 0x3696c8 0x6fc1060 0x934e0c60 0x934cefd4 0x93557820 0x91e2ed88 0x9724a0c8)++**

Answer 1

You are not alone - I have exactly the same problem. It sort of 'crept up on me' - downloads were at first slow, then they never completed, then the only way to quit was to force quit. It happens on several accounts loading from different servers, so is not a single email blocking up the system. Unfortunately, I have no simple answer!
I have been all this forum, trying whatever I can find - trashing this and that file - rebuilding - fixing permissions (take a look, it is discussed in several places) - even reinstalled the system from disc (10.5.4, then updated to 10.5.8)... That has worked for some people, but not me.
I will do a clean reinstall once I get back to my office from travels
Good luck
PL