can't delete messages

[coexist]

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I can't delete message. I keeping getting this message

Warning: unlink(msg/1.html): Permission denied in D:\Inetpub\coexistencefestival\mboard\mboard.php on line 593

[Klemen]

MBoard must have permission to read and write to all files in the "msg" folder. On Linux the command is CHMOD, on windows try right-clicking and select properties > Security. This might help:
http://www.ekhoury.com/2007/01/15/permi ... hp-on-iis/
or try searching Google.