The MAPI call 'OpenMsgStore' failed with the following error:
The attempt to log on to the Microsoft Exchange Server computer has failed.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0512-00000000
查看日志提示：第一个邮箱存储已达82G，超过了最大存储限制75G,但是本地磁盘还有足够的空间。。。
根据论坛之前的帖子，发现Exhange无法与DC通过389进行通信
用微软的那个exchange analysiser软件扫描出3个问题：
1.System pages设置太高
2.3GB is not set
3.Heapdecommitfreeblock Threshold is not set.