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==Server implementations==
{{sort-under}}
{| class="wikitable sortable sort-under" style="font-size: 85%; text-align: center; width: 100%;"
|- style="vertical-align:top"
|-
! Server name
! [[Software license|License]]
! [[Programming language]]
! RFC{{IETF RFC|2616}} HTTP/1.1
! RFC{{IETF RFC|2617}} HTTP {{abbr|auth.|authentication}}
! RFC{{IETF RFC|2518}} Web­DAV
! RFC{{IETF RFC|3253}} Web­DAV {{abbr|vers.|versioning}}
! RFC{{IETF RFC|3744}} Web­DAV ACL
! RFC{{IETF RFC|4324}} iCal {{abbr|CAP|Calendar Access Protocol}}
! RFC{{IETF RFC|4331}} Web­DAV quota
! RFC{{IETF RFC|4709}} Web­DAV mount
! RFC{{IETF RFC|4791}} Cal­DAV
! RFC{{IETF RFC|4918}} Web­DAV {{abbr|ext.|extensions}}
! RFC{{IETF RFC|5397}} Web­DAV current principal
! RFC{{IETF RFC|5545}} {{abbr|rev.|revised}} iCal
(Availability Check)
! RFC{{IETF RFC|5546}} iCal {{abbr|iTIP|transport-independent interoperability protocol}}(Group Scheduling)
! RFC{{IETF RFC|5689}} Web­DAV {{abbr|ext.|extended}} MKCOL
! RFC{{IETF RFC|5995}} Web­DAV POST add member
! RFC{{IETF RFC|6352}} Card­DAV vCard
! RFC{{IETF RFC|6578}} Web­DAV {{abbr|sync|synchronise}}
! RFC{{IETF RFC|6638}} Cal­DAV {{abbr|sched.|scheduling}}(Auto-Schedule)
! RFC{{IETF RFC|7529}} iCal <!-- abbreviation? -->{{abbr|RSCALE|non-Gregorian calendar}}
! RFC{{IETF RFC|7540}} HTTP/2
! RFC{{IETF RFC|7809}} Cal­DAV time zones by {{abbr|ref.|reference}}
! RFC{{IETF RFC|7953}} iCal <!-- abbreviation? -->{{abbr|VAVAIL­ABILITY|personal availability}}
! [http://www.calconnect.org/pubdocs/CD0903%20Freebusy%20Read%20URL.pdf <span title="FBURL">Free-busy URL</span>]
|-
| {{unk}}
| {{unk}}
| {{some}}<ref>[https://sogo.nu/bugs/view.php?id=1204 0001204: update the icalendar handling to rfc{{IETF RFC|5545}}]</ref><ref>[https://sogo.nu/bugs/view.php?id=4747 0004747: SOGo creates invalid GEO value on import]</ref><ref>[https://sogo.nu/bugs/view.php?id=3608 0003608: Cannot save/display multiple calendar alerts for one calendar event.]</ref><ref>[https://sogo.nu/bugs/view.php?id=2574 0002574: No colors selectable if ressource ID contains space character]</ref>
| {{unk}}
| {{unk}}
| {{unk}}
| {{unk}}
| {{some}}<ref>[https://sogo.nu/bugs/view.php?id=5163 0005163: no carddav RFC{{IETF RFC|6578}} compliance]</ref>
| {{unk}}
| {{unk}}
| 