Applies to: Exchange 2007 or later
If you migrate from one Exchange Server version to another, you might have different versions of Exchange servers, which is called a mixed-mode environment. While you have multiple Exchange Server versions in your environment, you must add a service account for each version of the Exchange server that you have in your environment.
Procedure
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From the CommCell Console, expand Client Computers > client.
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Right-click Exchange Mailbox, and then click Properties.
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From the Properties dialog box, click the Service Account Settings tab.
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Under Exchange Service Account, click Add.
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In the Exchange Service Account Credentials dialog box, enter the credentials for one of the Exchange server versions in your environment, and then click OK.
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Add an Exchange Service Account for each Exchange server version in your environment.
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Click OK.