I just did some research and sure enough you are right. Access 2000 and up use Jet 4.
In that case there is something else to tell you all... on my 2003 Server, I've encountered a bug with any web application that uses an MS Access database as back-end and gets a moderate number of hits. The site (and any other sites in same application pool) will go down. I have four Web Wiz Forums running on this server and all were going down. All other ASP/Access apps were going down, too, except for the ones having barely any visits per day.
I talked to a MS Support guy and he said there is a hotfix not published on their site because it is going into SP1 for 2003 Server. Here is the email he sent me after I talked on the phone with him (I'm going to create a new topic for this because it is important):
The hot fix for your issue has been packaged and placed on an HTTP site for you to download.
WARNING: This fix is not publicly available through the Microsoft website as it has not gone through full Microsoft regression testing. If you would like confirmation that this fix is designed to address your specific problem, or if you would like to confirm whether there are any special compatibility or installation issues associated with this fix, you are encouraged to speak to a Support Professional in Product Support Services.
The package is password protected so be sure to enter the appropriate password for each package. To ensure the right password is provided cut and paste the password from this mail.
NOTE: Passwords expire every 7 days so download the package within that period to insure you can extract the files. If you receive two passwords it means you are receiving the fix during a password change cycle. Use the second password if you download after the indicated password change date.
Package:
-----------------------------------------------------------
KB Article Number(s): 838306
Language: English
Platform: i386
Location: ( http://hotfixv4.microsoft.com/Windows%20Server%202003/sp1/Fi x102757/3790/free/184439_ENU_i386_zip.exe )
Password: ae^8WmiWHX
NOTE: Be sure to include all text between '(' and ')' when navigating to this hot fix location!
Thanks!