A number of times I get calender invites for meetings on my non-Lotus notes email IDs. The calender invites are normally in the .ics format. Once can easily import it into Lotus Notes. Here is how:
- Compose a mail inside notes
- Attach the .ics file to it
- Right click the attachment, and click on "View"
- The calender view would open, with the meeting details. Now accept/decline the invite, save and exit