OAB isn't updating

I have a problem with update Offline Address Book list.
The OAB is not updating and i tried to update maunally with this PS command:
Get-OfflineAddressbook “Default Offline Address book (Exchange 2013)” | Update-OfflineAddressBook

after that i checked if the OAB updated with this command:
Get-OfflineAddressbook | FT Name,LastTouch*

And I get old date (22/3/2015)

OAB not update
In addtion I tried to restart the Exchange Services , Restart the Server and no luck.

Please assist.
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Nick RhodeIT DirectorCommented:
I use this guide to update the OAB if I have an issues

Here:  Update OAB + GAL

Its a simple guide where you run the command and then open up the EMC and push.  The article is a step by step guide which also includes screenshots.
Robert-ProdigyAuthor Commented:
Hi Nick,
I have Exchange 2013 - not Exchange 2010.
Please assist.
Simon Butler (Sembee)ConsultantCommented:
How long did you wait after doing the OAB generation command?
Something should be logged if there is a problem with it.
Is the generating server still valid?


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