This article assumes that you have created your Free Outlook/Hotmail account and setup it's SMTP configuration as well as entered the same in Let's Calendar. Also in Let's Calendar your Sending Domain and email address is configured.
Step 1 - Click on “Campaigns” and “Campaigns List” in Let’s Calendar and view a list of campaigns you have already created. If you have not created any new campaigns so far, please create a new campaign first.
Step 2 - Click on “Edit” on any one of your campaigns
Step 3 - Under From Email id drop down, select the newly added Email id that is same as your identity in Outlook (Free) / Hotmail -> Or else if it's a new campaign select the newly added Email ID over here.
Step 4 - Keep rest settings same and click submit at the end of your campaign, or else enter test campaign data for your campaign over here. Ensure that the event date/time are set in future.
Step 5 - Wait for message “Campaign updated successfully”
Step 6 - Now head over to Campaign -> Send Invite
Step 7 - Select the Campaign you just now edited
Step 8 - Now click on “Send Test Calendar Invite” button
Step 9 - Enter your name and email id of an account that is not on the same domain (e.g. Gmail)
Step 10 - Click on Send Invite -> You should get a “Success” message, open the test email inbox and check for the calendar invite.