Extension support status

See:

- Capabilities: https://www.iana.org/assignments/imap-capabilities/imap-capabilities.xhtml#imap-capabilities-1
- Active drafts: https://datatracker.ietf.org/doc/search?name=imap&sort=&activedrafts=on&by=group&group=
- https://gist.github.com/nevans/8ef449da0786f9d1cc7c8324a288dd9b

| Extension | RFC | Client | Server |
|-----------------------|--------|--------|--------|
| IMAP4rev1 | [3501] | ✓ | ✓ |
| IMAP4rev2 | [9051] | ✓ | ✓ |
| NAMESPACE † | [2342] | ✓ | ✓ |
| UNSELECT † | [3691] | ✓ | ✓ |
| UIDPLUS † | [4315] | ✓ | ✓ |
| ESEARCH † | [4731] | ✓ | ✓ |
| SEARCHRES † | [5182] | ✓ | ✓ |
| ENABLE † | [5161] | ✓ | ✓ |
| IDLE † | [2177] | ✓ | ✓ |
| SASL-IR † | [4959] | ✓ | ✓ |
| LIST-EXTENDED † | [5258] | ✓ | ✓ |
| LIST-STATUS † | [5819] | ✓ | ✓ |
| MOVE † | [6851] | ✓ | ✓ |
| LITERAL- † | [7888] | ✓ | ✓ |
| STATUS=SIZE † | [8438] | ✓ | ✓ |
| ACL | [4314] | ✗ | ✗ |
| APPENDLIMIT | [7889] | ✓ | ✓ |
| BINARY | [3516] | ✓ | ✓ |
| CATENATE | [4469] | ✗ | ✗ |
| CHILDREN | [3348] | ✓ | ✓ |
| CONDSTORE | [7162] | ✓ | ✗ |
| CONVERT | [5259] | ✗ | ✗ |
| CREATE-SPECIAL-USE | [6154] | ✗ | ✗ |
| ESORT | [5267] | ✗ | ✗ |
| FILTERS | [5466] | ✗ | ✗ |
| ID | [2971] | ✓ | ✗ |
| LANGUAGE | [5255] | ✗ | ✗ |
| LIST-MYRIGHTS | [8440] | ✗ | ✗ |
| LITERAL+ | [7888] | ✓ | ✗ |
| LOGIN-REFERRALS | [2221] | ✗ | ✗ |
| MAILBOX-REFERRALS | [2193] | ✗ | ✗ |
| METADATA | [5464] | ✓ | ✗ |
| MULTIAPPEND | [3502] | ✗ | ✗ |
| MULTISEARCH | [7377] | ✗ | ✗ |
| NOTIFY | [5465] | ✗ | ✗ |
| OBJECTID | [8474] | ✗ | ✗ |
| PARTIAL | [9394] | ✗ | ✗ |
| PREVIEW | [8970] | ✗ | ✗ |
| QRESYNC | [7162] | ✗ | ✗ |
| QUOTA | [9208] | ✓ | ✗ |
| QUOTASET | [9208] | ✓ | ✗ |
| REPLACE | [8508] | ✗ | ✗ |
| SAVEDATE | [8514] | ✗ | ✗ |
| SEARCH=FUZZY | [6203] | ✗ | ✗ |
| SORT | [5256] | ✓ | ✗ |
| SORT=DISPLAY | [5957] | ✗ | ✗ |
| SPECIAL-USE | [6154] | ✓ | ✓ |
| THREAD | [5256] | ✓ | ✗ |
| UNAUTHENTICATE | [8437] | ✓ | ✓ |
| URL-PARTIAL | [5550] | ✗ | ✗ |
| URLAUTH | [4467] | ✗ | ✗ |
| ~~UTF8=ACCEPT~~ | [6855] | ✓ | ✓ |
| ~~UTF8=ONLY~~ | [6855] | ✗ | ✗ |
| UTF8=ACCEPT | [9755] | ✗ | ✗ |
| UTF8=ONLY | [9755] | ✗ | ✗ |
| WITHIN | [5032] | ✗ | ✗ |
| UIDONLY | [9586] | ✗ | ✗ |
| LIST-METADATA | [9590] | ✗ | ✗ |
| INPROGRESS | [9585] | ✗ | ✗ |
| JMAPACCESS | [9698] | ✗ | ✗ |

† Folded in IMAP4rev2

[3501]: https://www.rfc-editor.org/rfc/rfc3501.html
[9051]: https://www.rfc-editor.org/rfc/rfc9051.html
[2342]: https://www.rfc-editor.org/rfc/rfc2342.html
[3691]: https://www.rfc-editor.org/rfc/rfc3691.html
[4315]: https://www.rfc-editor.org/rfc/rfc4315.html
[4731]: https://www.rfc-editor.org/rfc/rfc4731.html
[5182]: https://www.rfc-editor.org/rfc/rfc5182.html
[5161]: https://www.rfc-editor.org/rfc/rfc5161.html
[2177]: https://www.rfc-editor.org/rfc/rfc2177.html
[4959]: https://www.rfc-editor.org/rfc/rfc4959.html
[5258]: https://www.rfc-editor.org/rfc/rfc5258.html
[5819]: https://www.rfc-editor.org/rfc/rfc5819.html
[6851]: https://www.rfc-editor.org/rfc/rfc6851.html
[7888]: https://www.rfc-editor.org/rfc/rfc7888.html
[8438]: https://www.rfc-editor.org/rfc/rfc8438.html
[4314]: https://www.rfc-editor.org/rfc/rfc4314.html
[7889]: https://www.rfc-editor.org/rfc/rfc7889.html
[3516]: https://www.rfc-editor.org/rfc/rfc3516.html
[4469]: https://www.rfc-editor.org/rfc/rfc4469.html
[3348]: https://www.rfc-editor.org/rfc/rfc3348.html
[7162]: https://www.rfc-editor.org/rfc/rfc7162.html
[5259]: https://www.rfc-editor.org/rfc/rfc5259.html
[6154]: https://www.rfc-editor.org/rfc/rfc6154.html
[5267]: https://www.rfc-editor.org/rfc/rfc5267.html
[5466]: https://www.rfc-editor.org/rfc/rfc5466.html
[2971]: https://www.rfc-editor.org/rfc/rfc2971.html
[5255]: https://www.rfc-editor.org/rfc/rfc5255.html
[8440]: https://www.rfc-editor.org/rfc/rfc8440.html
[7888]: https://www.rfc-editor.org/rfc/rfc7888.html
[2221]: https://www.rfc-editor.org/rfc/rfc2221.html
[2193]: https://www.rfc-editor.org/rfc/rfc2193.html
[5464]: https://www.rfc-editor.org/rfc/rfc5464.html
[3502]: https://www.rfc-editor.org/rfc/rfc3502.html
[7377]: https://www.rfc-editor.org/rfc/rfc7377.html
[5465]: https://www.rfc-editor.org/rfc/rfc5465.html
[8474]: https://www.rfc-editor.org/rfc/rfc8474.html
[8970]: https://www.rfc-editor.org/rfc/rfc8970.html
[7162]: https://www.rfc-editor.org/rfc/rfc7162.html
[9208]: https://www.rfc-editor.org/rfc/rfc9208.html
[9208]: https://www.rfc-editor.org/rfc/rfc9208.html
[8508]: https://www.rfc-editor.org/rfc/rfc8508.html
[8514]: https://www.rfc-editor.org/rfc/rfc8514.html
[6203]: https://www.rfc-editor.org/rfc/rfc6203.html
[5256]: https://www.rfc-editor.org/rfc/rfc5256.html
[5957]: https://www.rfc-editor.org/rfc/rfc5957.html
[6154]: https://www.rfc-editor.org/rfc/rfc6154.html
[5256]: https://www.rfc-editor.org/rfc/rfc5256.html
[8437]: https://www.rfc-editor.org/rfc/rfc8437.html
[5550]: https://www.rfc-editor.org/rfc/rfc5550.html
[4467]: https://www.rfc-editor.org/rfc/rfc4467.html
[6855]: https://www.rfc-editor.org/rfc/rfc6855.html
[6855]: https://www.rfc-editor.org/rfc/rfc6855.html
[5032]: https://www.rfc-editor.org/rfc/rfc5032.html
[9394]: https://www.rfc-editor.org/rfc/rfc9394.html
[9586]: https://www.rfc-editor.org/rfc/rfc9586.html
[9590]: https://www.rfc-editor.org/rfc/rfc9590.html
[9585]: https://www.rfc-editor.org/rfc/rfc9585.html
[9698]: https://www.rfc-editor.org/rfc/rfc9698.html
[9755]: https://www.rfc-editor.org/rfc/rfc9755.html

Start with the extension-support table in the issue, then compare its entries with the linked IANA capabilities page, active IETF drafts, and gist. Determine which client and server statuses need updating and leave the table consistent with those sources.

Written by the indexing model from the issue text.