Does your GFI Archiver resource usage SQL process ballon over 8GB? If so, the following procedure will reduce usage by about half and fix many performance issues.
The Import service can get stuck and this will stop all the mail in the MAIS Queue Folder. These are the emails that have not been processed and added to GFI Archiver yet, so do not delete them. Below is the fix on how I restored the import service and processed all the stuck email.
Configuring SQL Authentication can be tricky at times, and this is a great article that goes over the two types of authentication in SQL. I find some programs interface better with direct SQL authentication when Windows Authentication fails for any reason.