Opens mailbox and locks it.

None  

object.Lock

The Lock Method syntax has these parts:

Once you setup Filename property to point to mailbox file, you should call Lock method to let wodMailbox actually open mailbox file, count messages inside, and provides you with information about it. After Lock is called, you cannot change Filename property until you Unlock it first.

You should think of Lock as method that opens file and interactively access messages, as needed by your application. Once this method is issued, all the changes to the mailbox file in the background by 3rd application might lead to misinterpretations made by wodMailbox, so you shouldn't access same file using some other program. wodMailbox keeps position and length of each message in mailbox file, and if you try to change it somehow it may lead to invalid mailbox contents to be saved once you call Update method.