Global Address book corrupted need to recreate

Hi all, my global address book in my exchange 2010 environment is corrupted i believe beyond repair. How can i create a new one, but successfully migrate all of the contents over to the new one so that my users dont notice a difference.

For context the problems are users appear and disappear routinely from the list, about 2500 objects.
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I QasmiTechnical LeadCommented:
check out these article in detail:

check whether OAB is properly generated on the server.
Also it is added to the mailbox store as well properties.

Then check the distribution enabled or not through OWA  / Public folder etc.
Update once again the default OAB list and check the events whether it is generated completely or not as the events display it OAB sync completed succesfully,.

Then Intimate the Outlook users to use online mode and redownload the Full OAB which u can do and then follow what is mentioned above "

if you need trouble shooting OAB

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