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The Microsoft Exchange protocol documentation provides detailed technical specifications for the Microsoft protocols that are implemented and used by Microsoft Exchange to interoperate or communicate with other products. It also provides technical specifications for extensions to industry-standard and other published protocols that are used by Microsoft Exchange.

• The Microsoft Exchange protocol documentation provides detailed technical specifications for the Microsoft protocols and extensions to industry-standard and other published protocols that are implemented and used by Microsoft Exchange.
  
  The documentation is designed to describe each protocol in detail as it is used by Microsoft Exchange. Each specification documents technical requirements, limitations, dependencies, and specific protocol behavior.
  
  The documentation includes companion overview and reference documents that supplement the technical specifications with conceptual background information, overviews of inter-protocol relationships and interactions, and technical reference information.

Files

Status: Live This download is still available on microsoft.com. The downloads below will come directly from the Microsoft Download Center.

File	Size
Exchange_Protocols.zip SHA1: 1d0bb10929efc557f5cbbe6eceedbca28b76b481	120.81 MB
[MS-ASAIRS].pdf SHA1: 66b36fa56fdc7cee0c10c8ed8c8252bc1556261b	924 KB
[MS-ASCAL].pdf SHA1: 7f2540c3d840718c36c88bd059594765beab31b1	978 KB
[MS-ASCMD].pdf SHA1: d9f9119f14c059b4d5fd12ecb058799a32ac6738	4.76 MB
[MS-ASCNTC].pdf SHA1: cca8c4843b5325bd0008a09421d0858ab998a1ed	881 KB
[MS-ASCON].pdf SHA1: a273f20f450b5c92781ba36367466b3de531062e	582 KB
[MS-ASDOC].pdf SHA1: 245a305154467224012948055e41078fbcdbcc50	569 KB
[MS-ASDTYPE].pdf SHA1: 67d9c785a55c3d20feaaf156b06feed86e3ae7bb	529 KB
[MS-ASEMAIL].pdf SHA1: e09d108a153b46ce953a850463ca63803bb091d4	1.28 MB
[MS-ASHTTP].pdf SHA1: 2778a1192f803481ef0f2b5dabeacd680d49ff9c	673 KB
[MS-ASMS].pdf SHA1: 378324c87ec0e1e38bc8da6eafa56393f7ee5359	552 KB
[MS-ASNOTE].pdf SHA1: f4dab4a7ed8afceb13df8be02822bde30b1dee2b	547 KB
[MS-ASPROV].pdf SHA1: e10cb1be18f39308b5e7987cccc56197ce71808c	1.00 MB
[MS-ASRM].pdf SHA1: ecc4499058a0dc4701aa66099e9493bef4816376	698 KB
[MS-ASTASK].pdf SHA1: ba644bc51ae6e747376df6dc597b5fdab92a1e47	747 KB
[MS-ASWBXML].pdf SHA1: 070d08f68465b64c3c87f92963fc7fcc4d8bc589	728 KB
[MS-MCI].pdf SHA1: 1f89a691052a2cf1735e8738bf0a55bac4e80514	487 KB
[MS-OXABREF].pdf SHA1: 2ea19cce79e730908720a658bff3073d3692303e	572 KB
[MS-OXBBODY].pdf SHA1: 314c928c25acb29c9d01c753cf9c0778ea6f25c2	531 KB
[MS-OXCDATA].pdf SHA1: b70d19e236e2b8ae575759657bc10a7d09004213	1.58 MB
[MS-OXCEXT].pdf SHA1: 7cc68499a074523ae7b3a98d78f3ef90c109c6aa	846 KB
[MS-OXCFOLD].pdf SHA1: 41a748993507c1edba27e1586b34b25f8af97987	859 KB
[MS-OXCFXICS].pdf SHA1: 9fc97aaa0c718b66510298e417b4f13bdd416c70	2.28 MB
[MS-OXCICAL].pdf SHA1: 87edd672b367f3fb106965e176dcb766fe446477	2.02 MB
[MS-OXCMAIL].pdf SHA1: 074b3b7b3ad8c5038e8702fe06ee11400d5078f8	1.35 MB
[MS-OXCMAPIHTTP].pdf SHA1: e3120eca7e9e23114054e3d6e0e434ee81dc7ed5	1.59 MB
[MS-OXCMSG].pdf SHA1: 2b4022b4883d17287096d8cc233676caf585787f	1.06 MB
[MS-OXCNOTIF].pdf SHA1: 4eb5fdc01b1d7dfb8f72cac71af05669c21c89c0	643 KB
[MS-OXCPERM].pdf SHA1: d5e96a23f823f6596825e23a26328246c32080a5	653 KB
[MS-OXCPRPT].pdf SHA1: d2c8b381664a6c4dd85289ec09b19eae778cab63	878 KB
[MS-OXCROPS].pdf SHA1: 234bbfe4fa8dc85fab6d4ecf59fabed8fdc9ffcb	3.06 MB
[MS-OXCRPC].pdf SHA1: b1168b809ab485015f9a9fa18a7e6de3313c6e8a	1.38 MB
[MS-OXCSPAM].pdf SHA1: c9edc82e320f63afc8b210aea7dcd469fdf2e537	556 KB
[MS-OXCSTOR].pdf SHA1: 79eeab48ec5158e09ba36979c7012eead270e87d	809 KB
[MS-OXCTABL].pdf SHA1: 181c267e6873a00b07fb3c5719dccd9179c7d8ce	845 KB
[MS-OXDISCO].pdf SHA1: 27891248f46e0486033ad7cceb45097ce9e3cace	680 KB
[MS-OXDSCLI].pdf SHA1: c5e9f8f07ce6f7d547e17ae65bbe710a2c06e8fe	883 KB
[MS-OXGLOS].pdf SHA1: 8722fff31287f689ca9788abdd5e3e28d932d955	988 KB
[MS-OXIMAP4].pdf SHA1: ead01cf1d113a03379720fecd3a0d0541ddd21ed	757 KB
[MS-OXLDAP].pdf SHA1: 3a75891170a38c4fa33fd13963f7a7edf531c6d0	556 KB
[MS-OXMSG].pdf SHA1: 2de73abfae5fd65076ed2b8323108840fb643fe7	675 KB
[MS-OXNSPI].pdf SHA1: c5794283a37e350def50a39789132b24d337e748	1.06 MB
[MS-OXOABKT].pdf SHA1: 9b0307e70422d5e1d040f6935069ce1988399097	852 KB
[MS-OXOABK].pdf SHA1: 499f47973087226e4b8d06c2d059442a7fd050ea	972 KB
[MS-OXOAB].pdf SHA1: 0181a09b18fa4d9c9b3fb4c0cbd75cdfd29416be	1.19 MB
[MS-OXOCAL].pdf SHA1: b0bb121b0c9cd36ca27c28706d500401a0ada2db	1.96 MB
[MS-OXOCFG].pdf SHA1: 8e3d357980fffcaeb743fbb660abdd8d504b5518	1.28 MB
[MS-OXOCNTC].pdf SHA1: 5cec8f51d47e960b4653c349320c071792806b52	815 KB
[MS-OXODLGT].pdf SHA1: 156387365ad099a2539045b6621c4bbbeffb9bee	672 KB
[MS-OXODOC].pdf SHA1: dcbcc115358fd61fd0c2b09a55540c6de1fe6382	537 KB
[MS-OXOFLAG].pdf SHA1: dbafa8795bd2af1e48dff7ae62375cdf1e8a7786	697 KB
[MS-OXOJRNL].pdf SHA1: ab976a7ad7ecf27982561672c53c1febab9bcdc2	536 KB
[MS-OXOMSG].pdf SHA1: f9c6b9c28284693f4974ec4f48032972ed83b923	1.16 MB
[MS-OXONOTE].pdf SHA1: 624eb42955d08235244721f269b4b7025a99f711	503 KB
[MS-OXOPFFB].pdf SHA1: 3d33f3dbe58eca9764aba3e8653d1b03502e3103	613 KB
[MS-OXOPOST].pdf SHA1: d71d9750819441a2914058a36aa653eae8e6d53c	502 KB
[MS-OXORMDR].pdf SHA1: 4ae3f8604c3b3b7a2d3f45e2ae1c388b496984cd	716 KB
[MS-OXORMMS].pdf SHA1: f115d8bb28ccc14479f488253657607f1a70206b	711 KB
[MS-OXORSS].pdf SHA1: fa64dafabc2ad40f53a8a17dfdf6ebea1a3b9d61	341 KB
[MS-OXORULE].pdf SHA1: 68b7efcfff49639d5d9ff9cfe3d92d2510c5ceb3	895 KB
[MS-OXOSFLD].pdf SHA1: cdca488be0e55a87326809440410786b6b332082	647 KB
[MS-OXOSMIME].pdf SHA1: 129bbf0f772180861e0d0286135a293c6d6a8aba	508 KB
[MS-OXOSMMS].pdf SHA1: a54b467b73ea66c83fb6d6f57cc20e832755b2a0	553 KB
[MS-OXOSRCH].pdf SHA1: 68b01552a1880b0e9da2e9f84a596cb995c64262	652 KB
[MS-OXOTASK].pdf SHA1: 68d489b7fa2fcaaf247fcd2e084ddf04a211d5c6	700 KB
[MS-OXOUM].pdf SHA1: 7f2d0a1b2d1f66bdb140835c296f0dd0950b9c0d	642 KB
[MS-OXPFOAB].pdf SHA1: 6007d831717ce14ea74fd2d5dd727cd625c0c30d	529 KB
[MS-OXPHISH].pdf SHA1: 58acaa469c4d0f5aeacc28a30550d36100688fa7	479 KB
[MS-OXPOP3].pdf SHA1: 1b9d585d266834c48605f7f4cc0c497c14361c8f	954 KB
[MS-OXPROPS].pdf SHA1: c0a17796e0194324e9f600914d234103ba59d0ec	2.18 MB
[MS-OXPROTO].pdf SHA1: 55e9330d0e3d0d2e4d13d6631d74d074a86602b9	3.89 MB
[MS-OXPSVAL].pdf SHA1: 90a2055514acf9c9dd66054284995eea0eb96084	509 KB
[MS-OXREF].pdf SHA1: 5729d86611b104fa66e563e35192599f686df292	357 KB
[MS-OXRTFCP].pdf SHA1: 2b93e2fc9a27f6658071af1d160b74ac5a00d68e	675 KB
[MS-OXRTFEX].pdf SHA1: 5aa56efe831c668259b126629724d3ef5faf7295	603 KB
[MS-OXSHARE].pdf SHA1: 8ec32fe3247b22671a171ae413e7cd2ec707c5ab	666 KB
[MS-OXSHRMSG].pdf SHA1: a32083d7313bd4ca062a6712fe75d603ed5f3f55	525 KB
[MS-OXSMTP].pdf SHA1: 3547936f1aef87e33921d40beeb9e136b7cca9c3	557 KB
[MS-OXTNEF].pdf SHA1: 4ff28de3c29072b10eb4f4f7ec52a4fb0e0bb44c	776 KB
[MS-OXVCARD].pdf SHA1: 7eaf298af8512ef968ad2918ff4889ba662494d4	573 KB
[MS-OXWAVLS].pdf SHA1: 99927bfd4e520d953f6ad2b85f17b5f55985bc7f	858 KB
[MS-OXWCONFIG].pdf SHA1: dab53a359ea78875137780c7524cd226704cedae	1.14 MB
[MS-OXWMT].pdf SHA1: 1e6e21d2758a3906ef658572547ca2563ff6aa54	615 KB
[MS-OXWOAB].pdf SHA1: ba540bb630dea429e498c1af4a230956353ca583	508 KB
[MS-OXWOOF].pdf SHA1: c410c464a085b8bf2826c2428fab04431f00d85d	651 KB
[MS-OXWSADISC].pdf SHA1: 300dfaf3148571cf1a606bb4fd18eeaba621725a	1.11 MB
[MS-OXWSARCH].pdf SHA1: c3a33646abb2c0a23ee4833a2a2c622c2a41c567	615 KB
[MS-OXWSATT].pdf SHA1: 43cd59e40aa7cc42abad47e2e658db6329e04e50	783 KB
[MS-OXWSBTRF].pdf SHA1: 071c2609c81745125a67c88267ac366c3f8389e2	656 KB
[MS-OXWSCDATA].pdf SHA1: b7e110be32e53768163cbfb044e3dddf5fb321fc	2.09 MB
[MS-OXWSCEXT].pdf SHA1: 5177e02db350747a68844d322192e44841d06d52	782 KB
[MS-OXWSCONT].pdf SHA1: e399f954e2ebd060442c31e3468a0adbc9a9ebb9	1,012 KB
[MS-OXWSCONV].pdf SHA1: f77f89d7cec4a72478661634a44fe2d8212d8763	818 KB
[MS-OXWSCORE].pdf SHA1: 59b4a686d754ded67fef38d057059f9fd14c9776	1.42 MB
[MS-OXWSCOS].pdf SHA1: a8e40690e699881c9bf0c7a36cd3cc7f418ac281	1,009 KB
[MS-OXWSCVTID].pdf SHA1: 77d86e7e77ab9bd4477a88fab9715d1403810b4f	623 KB
[MS-OXWSDLGM].pdf SHA1: b8fa508ec3b7219629efee40b537a5c23b234667	786 KB
[MS-OXWSDLIST].pdf SHA1: 5f95863080fc8f704bac9a3523e09a6b8c6fb33c	422 KB
[MS-OXWSEDISC].pdf SHA1: 5030d4fbda069e34b4c38aefbcb8f4b264a42d0b	919 KB
[MS-OXWSFOLD].pdf SHA1: f9c5f5a706b7fae311709a0cab31fcc2cb4c68fb	1.06 MB
[MS-OXWSGNI].pdf SHA1: 8acfe7fb6304eca442eb15e956d98a693730c6b5	654 KB
[MS-OXWSGTRM].pdf SHA1: f8b29a8a8be8f46a3ff9176f3bf786275b93ee71	622 KB
[MS-OXWSGTZ].pdf SHA1: 332ae4b7dd07f26fe9efba351c29671494cd038d	691 KB
[MS-OXWSITEMID].pdf SHA1: 5e7f3cee6a978f165305d1c24ca053c2fbff2913	489 KB
[MS-OXWSLVID].pdf SHA1: 141e8521311b4996c63c79c9d045cd837778aafb	1.10 MB
[MS-OXWSMSG].pdf SHA1: 50ad720a360e0f1328e3f443ad42f721ac35bdc5	684 KB
[MS-OXWSMSHR].pdf SHA1: 4e76033d18bc3f89e21053ab9b402b34ad2d7632	721 KB
[MS-OXWSMTGS].pdf SHA1: 6ac5e761cd64bb7e7be9b062a39ff18eec24ce5d	1.13 MB
[MS-OXWSMTRK].pdf SHA1: 3aa1b887b29b6f2a5072aa46fa5f091f2210ac81	753 KB
[MS-OXWSNTIF].pdf SHA1: de6cfcd8f3b03790c612ee4c3bb948330c9de9b1	792 KB
[MS-OXWSOLPS].pdf SHA1: a0a1b1411fa64d6dbfe29c16605ad45f2185d74d	778 KB
[MS-OXWSPED].pdf SHA1: 90bf5a938dfb9b5091005e61de4619336e125c7c	556 KB
[MS-OXWSPERS].pdf SHA1: 1c0f955a0ec486c332a2a66cbfc1b5f9cf59c9e7	785 KB
[MS-OXWSPHOTO].pdf SHA1: 916252c15e920a9e78a3c6e8c381c9d51b1ecb57	479 KB
[MS-OXWSPOST].pdf SHA1: 3c47463cfda753f38cb71ea18a85f1d0a194aefb	647 KB
[MS-OXWSPSNTIF].pdf SHA1: 79d7ac32804b80501bb9648389295798470f7393	563 KB
[MS-OXWSRSLNM].pdf SHA1: 3ea453160ec3b65d5da290924562f60562bfdc0b	598 KB
[MS-OXWSRULES].pdf SHA1: 69ae8772a5d56e82549bd85aa141c4a18b9e244b	899 KB
[MS-OXWSSMBX].pdf SHA1: a5ae093a223d5ec3db8645b57d9bea018086fd29	598 KB
[MS-OXWSSRCH].pdf SHA1: d13377ccef6aa21411234d43e06fa7b28f5aca0f	1.01 MB
[MS-OXWSSYNC].pdf SHA1: f3981f964c6f26096a08146583186cb65f1fdb6b	735 KB
[MS-OXWSTASK].pdf SHA1: 43f382e3263a79dc051edc7f4d5a74fc55bccc58	690 KB
[MS-OXWSURPT].pdf SHA1: 226f355f767bc113d94f74cbe1bf8aadc5dd9b6e	616 KB
[MS-OXWSUSRCFG].pdf SHA1: d4f1b39951cd4ba70190583d15e322a83a5a5c93	745 KB
[MS-OXWSXPROP].pdf SHA1: f00f2b544efe5a2f2b77d3a41f2976858eb7470e	542 KB
[MS-OXWUMS].pdf SHA1: be1c8de09aadd8a5adaba32c78cad273114e75ba	901 KB
[MS-PATCH].pdf SHA1: b5f552778379ea8ea8b9cd3720e357e1908bfcf7	726 KB
[MS-XJRNL].pdf SHA1: 1b673badd61aa08cb027590775004c02499e72f0	541 KB
[MS-XLOGIN].pdf SHA1: 8fa16ac9b3ce5394b28ded70f70bd2e62e1a6f7e	664 KB
[MS-XOAUTH].pdf SHA1: 295fca16b16928c0cb27ee629e2334dc60dce9a8	551 KB
[MS-XWDCAL].pdf SHA1: 7db7e03d66cd5f625a23ae4372a17b279ad3740f	969 KB
[MS-XWDVSEC].pdf SHA1: 539e0f50810c8f24c5843a890a22c9d2b3118da9	637 KB
[[ReadmefirstExProto]].pdf SHA1: dab85691cfcd4c58ee1b5e339cd256ccd804f9fd	160 KB

File sizes and hashes are retrieved from the Wayback Machine’s indexes. They may not match the latest versions of files hosted on Microsoft servers.

• The specifications are available as Adobe Portable Document Format (.pdf) files, which you can open by using Adobe Reader. You can download Adobe Reader from http://www.adobe.com.
  
  Note: For optimal readability, Adobe Reader 8.0 or later is recommended.

• To help ensure that links between documents work correctly, store all the PDF files in the documentation set in the same directory. If you download additional protocol or standards support documents by Microsoft, you should store those files in that directory too.
  
  The self-extracting Exchange_Protocols.zip file contains all the specification and companion overview and reference documents that are included in the documentation set. The [[ReadmefirstExProto]].pdf file in the .zip file contains late-breaking information about the documentation.