I had seen this issue before, and I had tried mapping all MSDE logins to the workgroup file's Admin account with a NULL password. Didn't change anything. The...

YES, IT WORKED!

Adding the registry key looks like it made it run in-process and now I have no problem starting up the Jet Provider and accessing the linked server data...

Seems like it should be that easy, doesn't it? I have granted MSDE login to a couple user domain accounts (domain\user) and given them access to a couple databases....

Now the problem is figuring out how to set AllowInProcess to True for the Jet OLEDB provider. I don't have SQL Server (and thus no Enterprise Manager), only MSDE....

Well, I added my domain account to the server's Administrators group and everything works perfect. No more problems accessing the linked server when I'm accessing the MSDE from a...

Thanks for the replies so far...

I think I will add my domain user account to the server admin group, and then try again.

The MSDE installation is configured for Windows auth...

MDAC 2.8