Set your slack status based on Outlook calendar.

slackoutlook.scpt

launch application "Microsoft Outlook"
launch application "Slack"

property startDate : current date
property endDate : startDate + (10 * minutes)
property cachedStatus : ""
property results : {}
property running : true

global emailAddress
try
	emailAddress
on error
	display dialog "Email address..." default answer "firstlast@domain.com" with title "Email Address"
	set emailAddress to text returned of result
	
end try

repeat while running
	tell application "Microsoft Outlook"
		set results to query freebusy exchange account 1 for attendees emailAddress range start time startDate range end time endDate interval 5 as list
		set presentStatus to results's last item as string
		
		if presentStatus = cachedStatus then
			-- Do nothing
		else
			if presentStatus = "free" then
				tell application "System Events"
					tell application "Slack" to activate
					key code 18 using {command down}
					delay 1
					keystroke "/status :computer: Not in a meeting, probably hacking something."
					delay 0.5
					key code 36
					delay 0.3
					set visible of process "Slack" to false
				end tell
				set cachedStatus to "free"
			else if presentStatus = "tentative" then
				tell application "System Events"
					tell application "Slack" to activate
					key code 18 using {command down}
					delay 1
					keystroke "/status :grey_question:  I might be in a meeting, I might not be."
					delay 0.5
					key code 36
					delay 0.3
					set visible of process "Slack" to false
				end tell
				set cachedStatus to "tentative"
			else if presentStatus = "busy" then
				tell application "System Events"
					tell application "Slack" to activate
					key code 18 using {command down}
					delay 1
					keystroke "/status :spiral_calendar_pad: In a meeting"
					delay 0.5
					key code 36
					delay 0.3
					set visible of process "Slack" to false
				end tell
				set cachedStatus to "busy"
			else if presentStatus = "oof" then
				tell application "System Events"
					tell application "Slack" to activate
					key code 18 using {command down}
					delay 1
					keystroke "/status :car: Out Of The Office"
					delay 0.5
					key code 36
					delay 0.3
					set visible of process "Slack" to false
				end tell
				set cachedStatus to "oof"
			end if
		end if
	end tell
	
	delay 60
end repeat

No instructions for this one.
Please elaborate some setup and installation steps.