Actualy would be nice if they had a feature to set apear offline for only groups of people. I'd put all the guild members in one group, and block the others.
You can do that anyway... on MSN go to "Contacts" then "Sort Contacts By..." Then click "Groups"
Then make your own groups on the list.
They also have a program what's easy to install and you can have people blocked... but once you double click their names on the list... instead of getting a "You cannot send a message to ______ because they are not on your allow list"... It's just get a regular screen like when they're unblocked... and you can talk to them, while appearing offline on their screen cuz you blocked them

.
If you want the program i'll send it you.
It comes in handy, i usually have everyone blocked this way and can only talk to the people i want to talk to.
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