The following standards are implemented:

• RFC 4918/RFC 2518 (Core WebDAV) - implemented, except for COPY/MOVE/LOCK operations
• RFC 4791 (CalDAV) - fully implemented
• RFC 6352 (CardDAV) - fully implemented
• RFC 5397 (Current Principal) - fully implemented
• RFC 3253 (Versioning Extensions) - partially implemented, only the REPORT method and {DAV:}expand-property property
• RFC 3744 (Access Control) - partially implemented
• RFC 5995 (POST to create members) - fully implemented
• RFC 5689 (Extended MKCOL) - fully implemented

The following standards are not implemented:

• RFC 6638 (CalDAV Scheduling Extensions) - not implemented
• RFC 7809 (CalDAV Time Zone Extensions) - not implemented
• RFC 7529 (WebDAV Quota) - not implemented
• RFC 4709 (WebDAV Mount) - intentionally not implemented
• RFC 5546 (iCal iTIP) - not implemented
• RFC 4324 (iCAL CAP) - not implemented
• RFC 7953 (iCal AVAILABILITY) - not implemented

See DAV compliance for more detail on specification compliancy.