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CloseReview for Mailbox Alert by Gruvin
Rated 2 out of 5 stars
This is a cool extension -- I miss my notification sounds from the Outlook days.
But it doesn't seem to work on Mac OS X (I've ditched Windows since Vista -- the last straw!) If unable to fix that (sorry, wish I could help), I think you can specify that it's not MacOS compatible in the add-ons directory. Have a great day!
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