You can add a new member server to a DAG client.
Before You Begin
You must install the Exchange package on each member server using the fully qualified domain name.
Procedure
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From the navigation pane, go to Protect > Exchange.
The Exchange page appears.
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Click an Exchange database.
The Exchange Database page appears.
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In the General section, click Edit.
The Edit Exchange Database dialog box appears.
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From the Member servers list, select the member server that you want to add, and then click OK.
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Click Save.