Let’s say that you are new to Exchange 2007 and has created ConferenceRoom as a user mailbox rather than a room one. Do you need to delete it and create a new one with the same name?
No. You don’t have to do that! We can use the shell to change the type of the mailbox, say from user to a room one. Run the following command to achieve the same.
Set-Mailbox conferenceroom -Type Room
You can also convert it to an equipment mailbox if you want.
Set-Mailbox conferenceroom -Type Equipment
This is not a one way conversion. You can convert a room mailbox back into a user one as well. Basically you can convert it back and forth as much as you like!
Set-Mailbox conferenceroom -Type Regular
Note that for setting the type of a mailbox as a user one, the switch is -Type Regular and not User.