987
Microsoft MAPI/HTTP
Medium RiskTCP — Email
Port Overview
Port Number
987
Service Name
Microsoft MAPI/HTTP
Transport Protocol
TCP
Category
Email
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 987?
Microsoft Exchange MAPI over HTTP, introduced in Exchange 2013 SP1 as a replacement for Outlook Anywhere. Modern deployments prefer port 443.
TCP
Email
Security Considerations
Port 987 (Microsoft MAPI/HTTP) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.