- %SystemRoot%\Cluster
The cluster quorum database and other files for database availability groups (DAGs) on mailbox servers.
- %SystemDrive%\DAGFileShareWitnesses\
- %ExchangeInstallPath%ClientAccess\OAB
Offline Address Book files on mailbox servers.
- %ExchangeInstallPath%FIP-FS
Content scanning that’s used by the Malware agent and data loss prevention (DLP) on mailbox servers.
- %ExchangeInstallPath%GroupMetrics
Group Metrics files that are used to calculate values for the Large Audience and External Recipients MailTips on Mailbox servers.
- %ExchangeInstallPath%Logging
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Calendar Repair Assistant logs
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Managed Folder Assistant logs
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IMAP4 protocol logs
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POP3 protocol logs
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- %ExchangeInstallPath%Mailbox
- %ExchangeInstallPath%TransportRoles\Data\Adam
Active Directory Lightweight Directory Services (AD LDS) and log files on Edge transport servers.
- %ExchangeInstallPath%TransportRoles\Data\IpFilter
IP filter database, checkpoint, and log files on Edge transport servers.
- %ExchangeInstallPath%TransportRoles\Data\Queue
Queue database, checkpoint, and log files on Mailbox servers and Edge Transport servers.
- %ExchangeInstallPath%TransportRoles\Data\SenderReputation
Sender Reputation database, checkpoint, and log files on Mailbox servers and Edge Transport servers.
- %ExchangeInstallPath%TransportRoles\Data\Temp
Content conversion that’s done in the transport pipeline on Mailbox servers and Edge Transport servers.
- %ExchangeInstallPath%TransportRoles\Logs
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Agent logging
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Connectivity logging
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Message tracking
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Pipeline tracing
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Send and Receive connector protocol logging
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- %ExchangeInstallPath%TransportRoles\Pickup
The Pickup directory is used by administrators for mail flow testing or by applications that need to create and submit their own message files on Mailbox servers and Edge Transport server.
- %ExchangeInstallPath%TransportRoles\Replay
The Replay directory receives messages from foreign gateway servers and can also be used to resubmit messages that administrators export from the queues of Exchange servers on Mailbox servers and Edge Transport server.
- %ExchangeInstallPath%UnifiedMessaging\Grammars
Grammar files for different locales, for example en-EN or es-ES on Mailbox servers.
- %ExchangeInstallPath%UnifiedMessaging\Prompts
Voice prompts, greetings, and informational message files on Mailbox servers.
- %ExchangeInstallPath%UnifiedMessaging\Temp
Temporary files generated by Unified Messaging on Mailbox servers.
- %ExchangeInstallPath%UnifiedMessaging\Voicemail
Voice mail files that are temporarily stored on Mailbox servers.
- %ExchangeInstallPath%Working\OleConverter
Transport Neutral Encoding Format (TNEF), also known as Rich Text Format (RTF), to MIME/HTML conversions on Mailbox servers and Edge Transport server.
- %SystemDrive%\inetpub\temp\IIS Temporary Compressed Files
Internet Information Services (IIS) compression folder that’s used with Outlook on the web on Mailbox servers.
- %SystemRoot%\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files
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autodiscover
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ecp
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ews
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mapi
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mapi_emsmdb
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microsoft-server-activesync
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oab
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owa
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owa_calendar
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powershell
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root
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rpc
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- %SystemRoot%\System32\Inetsrv
IIS system files on Mailbox servers.