Yup. Heard of it. Every vm mfg I've ever dealt with says it doesn't exist. yeah..... right.....
But, I've never heard of it happening with the embedded vm.
Be sure that what your user doesn't mean a delayed LAMP rather than a delayed vm. Perception is everything here.
If it's just one user, blow off the VM and recreate it.
As for the time stamp, is the user in the same time zone as the VM? I'm wondering if when the user recieves the email if perhaps the time stamp is controlled by the email server rather than the VM. Send the user an email from Gmail or some other mail service other than the same domain the user is on. Then compare it's time stamps.
As for the embedded. The MXe has always supported embedded vm. Unless we're talking about the Mitel Call Director. I don't think that supports it yet.