Hello,
Kindlyrefer the following documents
Microsoft Exchange Information Store, mailboxes, and public folders are grayed out and cannot be selected even though Backup Exec Agent for Exchange is installed.
http://support.veritas.com/docs/265533
How to manually uninstall the Backup Exec 9.x ,10.0 or 10d Remote Agent
http://support.veritas.com/docs/232443
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Thanks.