This setting can be reset by failover, preferred server change, unreachable cache file, replication interval setback, or any other time you need to synch with a new server mail file.
In addition, if you had previously selected "Do not prompt me again" (see figure 10), but later change your mind, this is where you can reset this setting.
另外，如果您之前已选择了“Do not prompt me again”(参见图10)，但随后又改变了主意，也可以在这里重置这一设置。
3
You can reset the default namespace by setting it to an empty string.