It there a way to achieve this in Outlook.com or the current Outlook on Mac. On the web I can send e-mails from alias accounts, but not meeting invites.

The step that is missing is simple but needed. Open a new email, under the options tab in the new email, is the show fields . Click on the from and it will allow you to choose alternate addresses. Once you have set them up once, they stay with you.

If the above option does not work. open both your account calendars, lets call them A + B. To do this go onto calendar and using the list on left, open the other calendar B you also have access to (or open this from your address book). Once you are viewing both calendar A + B side by side. Right click on calendar B and select new appointment. Creating is new appointment will come from your account B. To be on the safe side, firstly invite account A and you should receive a calendar invite from account B. If so you know this has worked, and so you can now edit the invite to invite whoever you originally wanted. If you also need a Skype link but are unable to create one on account B. Simple create a new appointment in account A, copy the Skype link you have just created. And then paste into appointment in B, you can then delete the draft account A appointment. Hope that helps.

This worked for me for Office 365: Go to account settings > data file tab > " set as default" for the email address from which you want the invite to come. The default data file is the one that contains the calendar that's displayed.

Has anyone found an answer to this yet?

So, this does not work if you have POP/SMTP mail accounts as well as an exchange account in the same user profile... even though it looks like it is supposed to come from the account you choose (as you suggest above), the invite will end up coming from the exchange account - and any replies will go to that account as well. I have tried working on this problem for a while, but I have found no way around this so far. Help?

This is a terrible answer. No one just has a "from" button in their meeting invite. If they did, do you think they would be asking how to do it? VERY unhelpful.

Hi, How to I get the "From" button populated in the meeting invite? I have 2 email accounts set up and I am able to select which email account I want to send from as an email, but not in from the meeting invite. Thanks,