After migrating from SQL Server 2000 to SQL Server 2008 R2, we have a few domain accounts that appear to the new server as SQL Server accounts. These accounts can SELECT from tables in the database they are assigned to, but they are not able to write to them as they could under SQL Server 2000. The SQL Server 2008 R2 log shows that at least one account failed at its attempt to INSERT into a table with this message (excerpt):
Attempting to use NT account name with SQL Server Authentication....
This specific account had no problems doing its thing on SQL Server 2000, and nothing has changed at the account level, but the database it is assigned to "thinks" this account is a SQL Server account. Has anybody experienced this issue and resolved it?