Hello,

We recently moved from allowing direct booking in Outlook (which is being depreciated per MS) to resource scheduling in Exchange 2010 SP3 with clients using Outlook 2010. We have it set up so that users cannot directly book a meeting in a calendar they must schedule the resource as part of their meeting and then the resource scheduler accepts or denies the meeting and sends the requester and e-mail detailing the result of the booking request for the room. We only deny conflicting meetings. 

Once a user starts crafting a meeting in Outlook they are allowed to pick the same room from a cached drop down list of the location field in a meeting/appointment request. Is there any way we can turn off caching by group policy? The problem is that if they choose from the dropdown list in the location field in an Outlook meeting/appointment request rather than clicking on the ROOMS button and selecting the room, once they hit SEND Outlook will book the meeting in THIER calendar but not book the resource (as it is cached for some reason it will not send the request to exchange for resource booking) and most users will call IT and say hey the meeting booked even through it conflicts so something is wrong and I never got an e-mail, FIX IT! 

The reason this happens is that when you pick from the cached dropdown of locations the resource is never placed in the Resources field when you click the TO button so the resource scheduling does not process the scheduling of the resource. Most users don't even click TO before sending a meeting. 

It's another one of those IT Admin pains where unless you make this process goof proof users will find a way. If I could turn off caching then the problem is resolved.

I see how I can clear it here: http://www.slipstick.com/outlook/calendar/clear-the-location-drop-down-list-on-appointments/ 
but i would rather just turn it off natively by GPO if possible. I'm not a big fan of using regedits especially where different file paths for different versions are required. 

Any ideas would be appreciated. TIA

• Edited by Rich Ellis-MC 9 hours 52 minutes ago