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Consider the following scenario:
On an Exchange Single Copy Cluster (SCC) cluster, you install Microsoft Antigen 9.0 for Exchange with Service Pack 1.
The Exchange SCC cluster has two or more Exchange Virtual Server (EVS) instances.
In this scenario, Antigen 9.0 for Exchange with Service Pack 1 can reach a state in which all nodes contain Antigen registry values that point to the same shared disk.
Note The names of the Antigen registry values are APClusterSharedDisk and DatabasePath.
The AntigenService service does not start because the EVS instances are looking for an inaccessible shared disk. Later, the Information Store service cannot start either. This is because of the dependencies that AntigenService has with Exchange.
To resolve this problem, install Hotfix Rollup 5 for Antigen 9.0 for Exchange with Service Pack 1.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
957075 Description of Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1
Note You must install Antigen 9.0 for Exchange with Service Pack 1 before you install Hotfix Rollup 5 for Antigen 9.0 for Exchange with Service Pack 1.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Antigen 9.0 Information Store AntigenService cluster