Both single meetings and recurring meetings can be rescheduled as long as they have not been executed.
Click 
 the meeting title under Upcoming Meetings.
Select 
 a new date and new start and end times for the meeting.
If there may be a conflict with the meeting 
 time selected, a warning icon 
 is shown.
If the selected meeting time conflicts with the schedule of one or more of the selected attendees, a warning dialog is shown. For more information, see "Inviting attendees".
Click 
 Save and Close.
Open 
 the meeting in the calendar.
Select 
 a new date and new start and end times for the meeting as you would normally 
 do for meetings in the email client.
If there may be a conflict with the meeting time selected, the email client issues a warning. Note, however, that the client will only be able to check its local calendar.
If the selected meeting time conflicts with the schedule of one or more of the selected attendees, a warning dialog is shown. For more information, see "Inviting attendees".
Save 
 and close the rescheduled meeting.
When a meeting has been rescheduled, the updated information in synchronized between the email client and the MeetingBooster server the next time a synchronization is run.