I am responding to Greg's questions below in blue -- thanks Greg, for responding and I look forward to dialog about this:
This is a great questionsand I'm hoping we do get some ideas from the community. I want to make sure I have the correct idea. The idea is to send an meeting activity to an employee.
>>>To an employee or to someone outside of the company like a vendor or prospect or client. This is pretty standard stuff in Outlook and even Google calendar.
The employee can click on a link to accept the meeting.
>>>Yes, but... (see below)
Unfortunately, I've not seen this available in Method emails. On the other hand, I did have an idea. You can add a link to a custom page where an employee can accept or say they can make the meeting. Say they select the meeting activity from the grid and click a button called 'Accept'. It can save a value to a custom field on the activity and send you an email that the meeting has been accepted. The custom field can then be used to montior acceptance of a meeting.
>>>This accomplishes half of the point of a meeting request. The other half of the value of a meeting request is value for the recipient – it automatically adds the appointment to their calendar (so they don’t have to manually add it to the calendar or don't forget to add it) and with many systems it also tells you if the appointment conflicts with anything else on their own calendar (outside of Method, probably) when they try to accept. If you send me your email address, I will send you one and you will see. Frankly, it is this convenience for the recipient that is most important for us.