官方也回答了这个问题
Question
Can I use or set passwords on a personal geodatabase?
Answer
No, while the underlying(潜在的) .mdb file supports the use of passwords, the geodatabase and ArcGIS do not. Microsoft Access .mdb files that are password protected cannot be opened in ArcGIS, nor can password protected personal geodatabases be created in ArcGIS.
If the intention(意图) is to restrict users from accessing the personal geodatabase, setting the appropriate(适当的) user level permissions on the folder is recommended. For more information on setting different permissions for different users accessing a personal geodatabase, see the following ESRI Knowledge Base article in the Related Information below.
当然了，也不是不能连接。但始终是连的MS的mdb，不是真正的个人地理数据库，存储图形操作也就不方便了。
参考：
http://support.esri.com/em/knowledgebase/techarticles/detail/34871
http://support.esri.com/en/knowledgebase/techarticles/detail/25325
http://help.arcgis.com/zh-CN/Arcgisdesktop/10.0/Help/index.html#//005s00000023000000
http://forums.esri.com/Thread.asp?c=93&f=985&t=207927
本文转自我也是个傻瓜51CTO博客，原文链接： http://www.cnblogs.com/liweis/p/5274844.html，如需转载请自行联系原作者
