Can't drag and drop posted appointments in month view

After dragging an appointment to another day, once you go out and back in, the appointment is still in the original location. If you go into the details of the appointment and post a new date, it stays. Happens with GW7 sp1 or sp2.

Work around:

Open properties of the posted appointment and change the date there. Do not drag and drop.

Steps to Duplicate:

Create a Posted Appointment:

On calendar month view right click on a day and new->posted appointment

insert the subject place and any notes wanted then click post.

Now drag the posted appointment to a different date.

Click back on the mailbox then back on the calendar and it will go back to the original date.