A new bug in Windows Mail - version for 64-bit Vista SP2?

I've been seeing a consistent problem with Windows Mail lately,
the version for 64-bit Vista Home Premium SP2. Whenever I
try to enter a storage folder with 126891 unread news messages
(mainly to divide up the contents of the folder), Windows Mail
stops working correctly and offers me a chance to send in more
information along with the bug report.

When I enter a different folder with 73181 unread news messages,
things are a little slow but otherwise normal.

Some of the other problems I've seen on the same machine
suggest that a collection of programs compiled to run in 32-bit
mode cannot make full use of the 8 GB of memory this machine
has; only the lowest 4 GB, all that 32-bit addresses can address
directly. Is it true that Vista lacks the memory mapping needed
to run 32-bit mode programs at addresses above the lowest 4
GB? Also, is is true that the version of Windows Mail that
comes with 64-bit Vista has at least some part that must run in
32-bit mode?

When I have a set of BOINC programs running, with permission
to use up to 4 GB of memory, it could easily come close to
exhausting the lowest 4 GB of memory, since most of the
BOINC workunit programs were compiled to run in 32-bit
mode. However, neither BOINC nor Vista seems to offer
any memory restrictions specific to the use of the lowest 4 GB.

I've seen enough problems reported in the
microsoft.public.windows.live.mail.desktop newsgroup with
the Windows Live Mail user interface that I'm hesitant to
consider switching to that program. In particular, some of the
problem reports refer to functions controlled with buttons
labelled only with symbols, not with words. Since I'm rather
slow at learning the meaning of symbols not labelled with words,
I want to avoid using any programs that use such symbols.
Does the WLM program have the option of making labels of
the symbols appear in words, perhaps only when the cursor
is close enough to the symbol?

Or, is there any other workaround for splitting up such a large
folder of unread news messages?

Robert Miles