There is a setting buried deep within the Privacy Options that allows for
Tracked Changes in the document to reamin hidden on Open & Save. However,
it's buried deep for a very good reason - it does not *remove* the markup
content. Therefore, anyone can change the setting when they receive a copy
of the doc, thereby making all the markup visible once again.
Please take this in the helpful spirit in which it's intended: If you or
your co-workers are going to use the Track Changes features it would be a
good idea to first become fully familiar with all aspects of it... It is a
highly "discoverable" feature which has much the same volatility of someone
with no knowledge of firearms "discovering" a loaded handgun. You might
begin with the articles linked to from this Help page in Word;
http://office.microsoft.com/client/helppreview.aspx?AssetID=HA012190211033&ns=WINWORD&lcid=1033