Word/Outlook/Exchange Error

[MIScoord]

One of the users here at my company has an error crop up occasionally that I can't explain/trouble shoot. Our server is running Windows NT 4.0/Exchange 5.0 and the client machine is Windows 95. Every once in a while in Outlook 98, if the user tries to access a Word attachment in a message, they will get the following error:

WINWORD caused an invalid page fault in
module WINWORD.EXE at 014f:301f7be6.
Registers:
EAX=00007bc0 CS=014f EIP=301f7be6 EFLGS=00010246
EBX=00000000 SS=0157 ESP=0062f150 EBP=0062f304
ECX=00000000 DS=0157 ESI=0062f330 FS=0ce7
EDX=00000000 ES=0157 EDI=0074a40c GS=0000
Bytes at CS:EIP:
8b 03 57 f6 40 15 08 75 08 53 e8 e6 12 00 00 eb
Stack dump:
00000000 00000000 0062f330 00690330 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0070004f 006e0065 00000000 00000000 00800200

Closing the error screen causes Outlook to close, but Windows 95 doesn't seem to be affected. Also, Outlook can immediately be restarted without a problem, and the offending attachment can usually be opened without a problem. It only happens every once in a while and under different conditions (early morning, late in the day, with no other programs running, with several running, etc.). It's not a huge problem, but it is an annoyance, and if I can fix it, it would make my week.

Anyone have any ideas?