SQL schema, SQL logins

Dear Experts!

Our customer is installed SourceOne email management. Version is: 7.2

The program is working well.

Unfortunately we have two problems with the SQL database:

1. The S1 service user has many SQL schemas.

   Do the all sql service user schemas really required?

2. Many S1 computers (want worker, archive) want to login to the SQL databases.

   The sql is complaining the unsuccessful login attempts.Why?

Thanks a lot!

BR: Pal Szabo