email client for only reading email from mbox

[right . ho]

Dear experts,
   I have tried multiple emacs email clients (gnus, wanderlust and a bit of 
mew). Problem is that my company's IMAP server is very buggy - gmail imap works 
using similar configuration in gnus and wanderlust but my company's IMAP gives 
weird problems - hanging, showing a very small subset of mails. I never got 
around to setting up mew properly.

Thunderbird works tolerably - and I only need emacs to read mail. Not to fetch 
from IMAP, not to compose or send - just read and link from org-mode.

This gives me the idea that I should probably read thunderbird's mbox mail 
storage from emacs. But the "simple" configuration guides for all emacs email 
clients talk about the most popular use case - which is not mine. I am at my 
wits' end and turn to your expertise.

Setting up another local IMAP server has the problem that I have 10 GB email - 
millions in number. The machine I use at work is already not up to performing 
its usual work - I am not sure if I can burden it with IMAP server. Secondly I 
need to run on windows - dovecot sayis it is for UNIX.

Can one of you provide pointers to this usage? Summary :

I do NOT need :
1. fetching email, using IMAP or anything else.
2. sending email
3. filtering email
4. not particular on which emacs client to use, if it is good

Constraints I have :
1. Tons of email
2. Windows OS
3. Thunderbird's mbox files to be read-only
4. Reading mail and linking to mail from org-mode

thanks a lot
Bingo