We were moving our mailbox from our old Exchange 2003 server to a new Exchange 2010 server, we moved the vast majority of people no problems, however there were about 10 or so users who we had this error with.
Problem:
“Property expression <blah> isn’t valid. Valid values are: …..”
Now the user’s mailbox on Exchange 2003 worked fine, we could access and change any of the properties via ADUC on Windows 2003.
Symptoms:
We couldn’t move the mailbox or edit any of its properties in Exchange 2010 management tools, we just got an error message saying similar to above about an invalid character.
Solution:
Upon opening the ADUC and checking for the invalid fields we found that the users “Alias” field under “Exchange General” tab was set to the users email address containing an @ (at symbol), this was what was causing the issue. When I changed the “alias” field just to be the users name (rather than the email address) I could move the folder and access the properties no problem.