摘要： When you try to start Visual SourceSafe, you may receive the following error message: Um.dat may be corrupt CAUSE New Database When you create a new database, a 3.1 database format is converted to a 5.0 database format, which is then converted to a 6.0 database format. If the conversion is not completed, the database may still be in 3.1 format. Check the Version.dat file to see if the version number is 6.0. If the version number is 5.0, the database is still in 3.1 format. br 阅读全文