Hi All We are running Exchange 2007 SP1 and Outlook 2007. Most clients use cached Exchange mode. We have a strange problem where some of those clients seem to be stuck on an older version of the Address Book. Others are fine. I had some questions I was hoping someone could help with - 1. If a client is using cached Exchange mode, will they automatically be using the OAB? 2. Is there anyway to check on the client which OAB (i.e. when it was generated) it is using? 3. Is there anyway on the client to force a a download of the latest OAB? 4. What is the period that the OAB is distributed to clients? Is it every 24 hours for all clients, randomly dispersed etc? 5. Any OAB troubleshooting tools people can recommend? I recall OABGen, not sure if there are any new ones? (I know there is a similar question open for Exchange 2010, but this is Exchange 2007 specific - if the same applies, please let me know and I'll close this thread down)

On Sun, 24 Oct 2010 10:08:20 +0000, Chuck_P2101 wrote: >We are running Exchange 2007 SP1 and Outlook 2007. Most clients use cached Exchange mode. > >We have a strange problem where some of those clients seem to be stuck on an older version of the Address Book. Others are fine. I had some questions I was hoping someone could help with - > >1. If a client is using cached Exchange mode, will they automatically be using the OAB? Yes. >2. Is there anyway to check on the client which OAB (i.e. when it was generated) it is using? You can check the date on the *.oab files on the machine. They shouldn't be more than a day or two old (roughly). >3. Is there anyway on the client to force a a download of the latest OAB? It's an option on the "Tools" menu. Just mashing the "F9" key usually works, too. >4. What is the period that the OAB is distributed to clients? Is it every 24 hours for all clients, randomly dispersed etc? The OAB is downloaded by the client, usually when Outlook starts, but not more often than once every 24 hours. If the intial downlad is unsuccessful then Outlook randomizes the retry time (so it would be unlikely that every OL wouuld retry the download at the same time). >5. Any OAB troubleshooting tools people can recommend? I recall OABGen, not sure if there are any new ones? Well, if some clients download it and some don't it's not likely to be a problem withe the OAB generation. You could try deleting the *.oab files from the local machine and then start Outlook. If the *.oab files reappear you'll know the OAB download stuff is working and whatever the problem is it's probably local to the client. If you suspect there's a problem with the OAB generation, start here: http://blogs.msdn.com/b/dgoldman/archive/2005/08/28/457378.aspx --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Hi , I agree with Rich, and here are some more articles for you. Address Lists in Exchange 2007 (Part3) http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/address-lists-exchange-2007-part3.html Address Lists in Exchange 2007 (Part 4) http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/address-lists-exchange-2007-part4.html Please feel free to let me know if you have any questions. Best regards, Serena