Repository: adamgibbons/ics
Pull request #120 (2019-10-04 13:59:23)

added functionality for `X-MICROSOFT-CDO-BUSYSTATUS`
Using this library to create large calendars with >100 all-day events that recur for 80 years (crazy), and most people who use consume this calendar use Outlook. The default busy status for any event in outlook is `BUSY` which is problematic because it kills the Outlook functionality to check for availability. Therefore, I'm moving to add functionality to support for `X-MICROSOFT-CDO-BUSYSTATUS`

adamgibbons: Thank you - Outlook is a blind spot for me. Great PR.

Patch:
diff --git a/README.md b/README.md
index 3831d7b..28bb4c1 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ const event = {
   geo: { lat: 40.0095, lon: 105.2669 },
   categories: ['10k races', 'Memorial Day Weekend', 'Boulder CO'],
   status: 'CONFIRMED',
+  busyStatus: 'BUSY',
   organizer: { name: 'Admin', email: 'Race@BolderBOULDER.com' },
   attendees: [
     { name: 'Adam Gibbons', email: 'adam@example.com', rsvp: true, partstat: 'ACCEPTED', role: 'REQ-PARTICIPANT' },
@@ -54,6 +55,7 @@ ics.createEvent(event, (error, value) => {
   // DTSTAMP:20181017T204900Z
   // DTSTART:20180530T043000Z
   // DESCRIPTION:Annual 10-kilometer run in Boulder\, Colorado
+  // X-MICROSOFT-CDO-BUSYSTATUS:BUSY
   // URL:http://www.bolderboulder.com/
   // GEO:40.0095;105.2669
   // LOCATION:Folsom Field, University of Colorado (finish line)
@@ -77,6 +79,7 @@ const ics = require('ics')
 ics.createEvent({
   title: 'Dinner',
   description: 'Nightly thing I do',
+  busyStatus: 'FREE',
   start: [2018, 1, 15, 6, 30],
   duration: { minutes: 50 }
 }, (error, value) => {
@@ -228,6 +231,7 @@ The following properties are accepted:
 | method        | This property defines the iCalendar object method associated with the calendar object. When used in a MIME message entity, the value of this property MUST be the same as the Content-Type "method" parameter value.  If either the "METHOD" property or the Content-Type "method" parameter is specified, then the other MUST also be specified. | `PUBLISH`
 | recurrenceRule        | A recurrence rule, commonly referred to as an RRULE, defines the repeat pattern or rule for to-dos, journal entries and events. If specified, RRULE can be used to compute the recurrence set (the complete set of recurrence instances in a calendar component). You can use a generator like this [one](https://www.textmagic.com/free-tools/rrule-generator) | `FREQ=DAILY`
 | sequence      | For sending an update for an event (with the same uid), defines the revision sequence number. | `2`
+| busyStatus    | Used to specify busy status for Microsoft applications, like Outlook. See [Microsoft spec](https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxcical/cd68eae7-ed65-4dd3-8ea7-ad585c76c736). | `'BUSY'` OR `'FREE'` OR `'TENTATIVE`' OR `'OOF'`
 
 To create an **all-day** event, pass only three values (`year`, `month`, and `date`) to the `start` and `end` properties.
 The date of the `end` property should be the day *after* your all-day event.
diff --git a/package-lock.json b/package-lock.json
index 58588e6..30848c7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ics",
-  "version": "2.14.0",
+  "version": "2.16.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -10,7 +10,7 @@
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       "dev": true,
       "requires": {
-        "@babel/highlight": "7.0.0"
+        "@babel/highlight": "^7.0.0"
       }
     },
     "@babel/core": {
@@ -19,20 +19,20 @@
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       "dev": true,
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-        "@babel/generator": "7.4.4",
-        "@babel/helpers": "7.4.4",
-        "@babel/parser": "7.4.5",
-        "@babel/template": "7.4.4",
-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4",
-        "convert-source-map": "1.6.0",
-        "debug": "4.1.1",
-        "json5": "2.1.0",
-        "lodash": "4.17.11",
-        "resolve": "1.11.1",
-        "semver": "5.7.0",
-        "source-map": "0.5.7"
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.4.4",
+        "@babel/helpers": "^7.4.4",
+        "@babel/parser": "^7.4.5",
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.4.5",
+        "@babel/types": "^7.4.4",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
       },
       "dependencies": {
         "debug": {
@@ -41,7 +41,7 @@
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           "dev": true,
           "requires": {
-            "ms": "2.1.2"
+            "ms": "^2.1.1"
           }
         },
         "ms": {
@@ -58,11 +58,11 @@
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       "dev": true,
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-        "@babel/types": "7.4.4",
-        "jsesc": "2.5.2",
-        "lodash": "4.17.11",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "@babel/types": "^7.4.4",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.11",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
       },
       "dependencies": {
         "jsesc": {
@@ -79,7 +79,7 @@
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       "dev": true,
       "requires": {
-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.0.0"
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     "@babel/helper-builder-binary-assignment-operator-visitor": {
@@ -88,8 +88,8 @@
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       "dev": true,
       "requires": {
-        "@babel/helper-explode-assignable-expression": "7.1.0",
-        "@babel/types": "7.4.4"
+        "@babel/helper-explode-assignable-expression": "^7.1.0",
+        "@babel/types": "^7.0.0"
       }
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     "@babel/helper-call-delegate": {
@@ -98,9 +98,9 @@
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       "dev": true,
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-        "@babel/helper-hoist-variables": "7.4.4",
-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
+        "@babel/helper-hoist-variables": "^7.4.4",
+        "@babel/traverse": "^7.4.4",
+        "@babel/types": "^7.4.4"
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     "@babel/helper-define-map": {
@@ -109,9 +109,9 @@
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       "dev": true,
       "requires": {
-        "@babel/helper-function-name": "7.1.0",
-        "@babel/types": "7.4.4",
-        "lodash": "4.17.11"
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/types": "^7.4.4",
+        "lodash": "^4.17.11"
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     "@babel/helper-explode-assignable-expression": {
@@ -120,8 +120,8 @@
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       "dev": true,
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-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.0.0"
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     "@babel/helper-function-name": {
@@ -130,9 +130,9 @@
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-        "@babel/helper-get-function-arity": "7.0.0",
-        "@babel/template": "7.4.4",
-        "@babel/types": "7.4.4"
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
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     "@babel/helper-get-function-arity": {
@@ -141,7 +141,7 @@
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       "dev": true,
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-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.0.0"
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@@ -150,7 +150,7 @@
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       "dev": true,
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-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.4.4"
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@@ -159,7 +159,7 @@
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       "dev": true,
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-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.0.0"
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@@ -168,7 +168,7 @@
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-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.0.0"
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@@ -177,12 +177,12 @@
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-        "@babel/template": "7.4.4",
-        "@babel/types": "7.4.4",
-        "lodash": "4.17.11"
+        "@babel/helper-module-imports": "^7.0.0",
+        "@babel/helper-simple-access": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/template": "^7.4.4",
+        "@babel/types": "^7.4.4",
+        "lodash": "^4.17.11"
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@@ -191,7 +191,7 @@
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       "dev": true,
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-        "@babel/types": "7.4.4"
+        "@babel/types": "^7.0.0"
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@@ -206,7 +206,7 @@
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       "dev": true,
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-        "lodash": "4.17.11"
+        "lodash": "^4.17.11"
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-        "@babel/template": "7.4.4",
-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
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+        "@babel/helper-wrap-function": "^7.1.0",
+        "@babel/template": "^7.1.0",
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.0.0"
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@@ -228,10 +228,10 @@
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-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
+        "@babel/helper-member-expression-to-functions": "^7.0.0",
+        "@babel/helper-optimise-call-expression": "^7.0.0",
+        "@babel/traverse": "^7.4.4",
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-        "@babel/types": "7.4.4"
+        "@babel/template": "^7.1.0",
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+        "@babel/types": "^7.4.4"
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@@ -259,10 +259,10 @@
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-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/template": "^7.1.0",
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.2.0"
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@@ -271,9 +271,9 @@
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-        "@babel/traverse": "7.4.5",
-        "@babel/types": "7.4.4"
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+        "@babel/traverse": "^7.4.4",
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@@ -282,9 +282,9 @@
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       "dev": true,
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-        "chalk": "2.4.2",
-        "esutils": "2.0.2",
-        "js-tokens": "4.0.0"
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
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       "dependencies": {
         "ansi-styles": {
@@ -293,7 +293,7 @@
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-            "color-convert": "1.9.3"
+            "color-convert": "^1.9.0"
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@@ -302,9 +302,9 @@
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-            "escape-string-regexp": "1.0.5",
-            "supports-color": "5.5.0"
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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@@ -319,7 +319,7 @@
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@@ -336,9 +336,9 @@
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@@ -347,8 +347,8 @@
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-        "@babel/plugin-syntax-json-strings": "7.2.0"
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@@ -5437,23 +5456,23 @@
       "integrity": "sha512-vIu34EkyNyJxmP0jscNzWBSygh7VWhqun6RmqVfXePrOwi9lhvRs//dOaGOTRUQr4tx7/zd26Tk5WeSVZitgng==",
       "dev": true,
       "requires": {
-        "fs-mkdirp-stream": "1.0.0",
-        "glob-stream": "6.1.0",
-        "graceful-fs": "4.2.0",
-        "is-valid-glob": "1.0.0",
-        "lazystream": "1.0.0",
-        "lead": "1.0.0",
-        "object.assign": "4.1.0",
-        "pumpify": "1.5.1",
-        "readable-stream": "2.3.6",
-        "remove-bom-buffer": "3.0.0",
-        "remove-bom-stream": "1.2.0",
-        "resolve-options": "1.1.0",
-        "through2": "2.0.5",
-        "to-through": "2.0.0",
-        "value-or-function": "3.0.0",
-        "vinyl": "2.2.0",
-        "vinyl-sourcemap": "1.1.0"
+        "fs-mkdirp-stream": "^1.0.0",
+        "glob-stream": "^6.1.0",
+        "graceful-fs": "^4.0.0",
+        "is-valid-glob": "^1.0.0",
+        "lazystream": "^1.0.0",
+        "lead": "^1.0.0",
+        "object.assign": "^4.0.4",
+        "pumpify": "^1.3.5",
+        "readable-stream": "^2.3.3",
+        "remove-bom-buffer": "^3.0.0",
+        "remove-bom-stream": "^1.2.0",
+        "resolve-options": "^1.1.0",
+        "through2": "^2.0.0",
+        "to-through": "^2.0.0",
+        "value-or-function": "^3.0.0",
+        "vinyl": "^2.0.0",
+        "vinyl-sourcemap": "^1.1.0"
       }
     },
     "vinyl-sourcemap": {
@@ -5462,13 +5481,13 @@
       "integrity": "sha1-kqgAWTo4cDqM2xHYswCtS+Y7PhY=",
       "dev": true,
       "requires": {
-        "append-buffer": "1.0.2",
-        "convert-source-map": "1.6.0",
-        "graceful-fs": "4.2.0",
-        "normalize-path": "2.1.1",
-        "now-and-later": "2.0.1",
-        "remove-bom-buffer": "3.0.0",
-        "vinyl": "2.2.0"
+        "append-buffer": "^1.0.2",
+        "convert-source-map": "^1.5.0",
+        "graceful-fs": "^4.1.6",
+        "normalize-path": "^2.1.1",
+        "now-and-later": "^2.0.0",
+        "remove-bom-buffer": "^3.0.0",
+        "vinyl": "^2.0.0"
       }
     },
     "vinyl-sourcemaps-apply": {
@@ -5477,7 +5496,7 @@
       "integrity": "sha1-q2VJ1h0XLCsbh75cUI0jnI74dwU=",
       "dev": true,
       "requires": {
-        "source-map": "0.5.7"
+        "source-map": "^0.5.1"
       }
     },
     "which": {
@@ -5486,7 +5505,7 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -5501,7 +5520,7 @@
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2"
+        "string-width": "^1.0.2 || 2"
       }
     },
     "wrap-ansi": {
@@ -5510,8 +5529,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       }
     },
     "wrappy": {
@@ -5538,19 +5557,19 @@
       "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.3",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "5.0.0"
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^5.0.0"
       }
     },
     "yargs-parser": {
@@ -5559,7 +5578,7 @@
       "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0"
+        "camelcase": "^3.0.0"
       }
     },
     "yargs-unparser": {
@@ -5568,9 +5587,9 @@
       "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
       "dev": true,
       "requires": {
-        "flat": "4.1.0",
-        "lodash": "4.17.11",
-        "yargs": "12.0.5"
+        "flat": "^4.1.0",
+        "lodash": "^4.17.11",
+        "yargs": "^12.0.5"
       },
       "dependencies": {
         "ansi-regex": {
@@ -5591,9 +5610,9 @@
           "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
           "dev": true,
           "requires": {
-            "string-width": "2.1.1",
-            "strip-ansi": "4.0.0",
-            "wrap-ansi": "2.1.0"
+            "string-width": "^2.1.1",
+            "strip-ansi": "^4.0.0",
+            "wrap-ansi": "^2.0.0"
           }
         },
         "find-up": {
@@ -5602,7 +5621,7 @@
           "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
           "dev": true,
           "requires": {
-            "locate-path": "3.0.0"
+            "locate-path": "^3.0.0"
           }
         },
         "invert-kv": {
@@ -5623,7 +5642,7 @@
           "integrity": "sha512-avPEb8P8EGnwXKClwsNUgryVjllcRqtMYa49NTsbQagYuT1DcXnl1915oxWjoyGrXR6zH/Y0Zc96xWsPcoDKeA==",
           "dev": true,
           "requires": {
-            "invert-kv": "2.0.0"
+            "invert-kv": "^2.0.0"
           }
         },
         "os-locale": {
@@ -5632,9 +5651,9 @@
           "integrity": "sha512-Z8l3R4wYWM40/52Z+S265okfFj8Kt2cC2MKY+xNi3kFs+XGI7WXu/I309QQQYbRW4ijiZ+yxs9pqEhJh0DqW3Q==",
           "dev": true,
           "requires": {
-            "execa": "1.0.0",
-            "lcid": "2.0.0",
-            "mem": "4.3.0"
+            "execa": "^1.0.0",
+            "lcid": "^2.0.0",
+            "mem": "^4.0.0"
           }
         },
         "string-width": {
@@ -5643,8 +5662,8 @@
           "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
           }
         },
         "strip-ansi": {
@@ -5653,7 +5672,7 @@
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "3.0.0"
+            "ansi-regex": "^3.0.0"
           }
         },
         "which-module": {
@@ -5668,18 +5687,18 @@
           "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
           "dev": true,
           "requires": {
-            "cliui": "4.1.0",
-            "decamelize": "1.2.0",
-            "find-up": "3.0.0",
-            "get-caller-file": "1.0.3",
-            "os-locale": "3.1.0",
-            "require-directory": "2.1.1",
-            "require-main-filename": "1.0.1",
-            "set-blocking": "2.0.0",
-            "string-width": "2.1.1",
-            "which-module": "2.0.0",
-            "y18n": "3.2.1",
-            "yargs-parser": "11.1.1"
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
           }
         },
         "yargs-parser": {
@@ -5688,8 +5707,8 @@
           "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
           "dev": true,
           "requires": {
-            "camelcase": "5.3.1",
-            "decamelize": "1.2.0"
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
           }
         }
       }
diff --git a/src/pipeline/format.js b/src/pipeline/format.js
index 7c95c5f..03dcbcb 100644
--- a/src/pipeline/format.js
+++ b/src/pipeline/format.js
@@ -36,7 +36,8 @@ export default function formatEvent(attributes = {}) {
     organizer,
     attendees,
     alarms,
-    recurrenceRule
+    recurrenceRule,
+    busyStatus
   } = attributes
 
   let icsFormat = ''
@@ -69,6 +70,7 @@ export default function formatEvent(attributes = {}) {
   icsFormat += status ? (foldLine(`STATUS:${status}`) + '\r\n') : ''
   icsFormat += categories ? (foldLine(`CATEGORIES:${categories}`) + '\r\n') : ''
   icsFormat += organizer ? (foldLine(`ORGANIZER;${setOrganizer(organizer)}`) + '\r\n') : ''
+  icsFormat += busyStatus ? (foldLine(`X-MICROSOFT-CDO-BUSYSTATUS:${busyStatus}`) + '\r\n') : ''
 
   if (attendees) {
     attendees.map(function (attendee) {
diff --git a/src/schema/index.js b/src/schema/index.js
index fbffd85..33215ea 100644
--- a/src/schema/index.js
+++ b/src/schema/index.js
@@ -72,6 +72,7 @@ const schema = Joi.object().keys({
   attendees: Joi.array().items(contactSchema),
   alarms: Joi.array().items(alarmSchema),
   recurrenceRule: Joi.string(),
+  busyStatus: Joi.string().regex(/TENTATIVE|FREE|BUSY|OOF/),
 }).xor('end', 'duration')
 
 export default function validateEvent(candidate) {


Test patch:
diff --git a/test/pipeline/format.spec.js b/test/pipeline/format.spec.js
index 3c6b916..34f9a3a 100644
--- a/test/pipeline/format.spec.js
+++ b/test/pipeline/format.spec.js
@@ -157,6 +157,20 @@ describe('pipeline.formatEvent', () => {
     expect(formattedEvent).to.contain('ATTENDEE;RSVP=FALSE;CN=Adam Gibbons:mailto:adam@example.com')
     expect(formattedEvent).to.contain('ATTENDEE;RSVP=TRUE;CN=Brittany Seaton:mailto:brittany@example.com')
   })
+  it('writes a busystatus', () => {
+    const eventFree = buildEvent({ busyStatus: "FREE" })
+    const eventBusy = buildEvent({ busyStatus: "BUSY"})
+    const eventTent = buildEvent({ busyStatus: "TENTATIVE"})
+    const eventOOF = buildEvent({ busyStatus: "OOF" })
+    const formattedEventFree = formatEvent(eventFree)
+    const formattedEventBusy = formatEvent(eventBusy)
+    const formattedEventTent = formatEvent(eventTent)
+    const formattedEventOOF = formatEvent(eventOOF)
+    expect(formattedEventFree).to.contain('X-MICROSOFT-CDO-BUSYSTATUS:FREE')
+    expect(formattedEventBusy).to.contain('X-MICROSOFT-CDO-BUSYSTATUS:BUSY')
+    expect(formattedEventTent).to.contain('X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE')
+    expect(formattedEventOOF).to.contain('X-MICROSOFT-CDO-BUSYSTATUS:OOF')
+  })
   it('writes an organizer', () => {
     const event = formatEvent({ organizer: {
       name: 'Adam Gibbons',